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分析:unless除非,如果不; if是否,如果;until直到;So因此。句意:如果你有問(wèn)題,給你的老師說(shuō)說(shuō),你就會(huì)得到幫助。故選B??键c(diǎn):考查連詞辨析24.—I’m busy with my schoolwork these days.—That’s great! You won’t get good grades ______ you work hard.A.if B.becauseC.unless D.a(chǎn)fter【答案】C【解析】試題分析:句意:這些天我忙著學(xué)校工作。那太好了,除非你努力工作,否則你不會(huì)取得好成績(jī)。A. if如果; B. because因?yàn)椋?C. unless除非; D. after在……之后,根據(jù)句意此題選C。考點(diǎn):考查連詞的用法25.Lots of people exercise every morming_________bad weather stops them.A.if B.unless C.until D.since【答案】B【解析】考查連詞詞義辨析。A. if“如果”;B. unless“除非;如果不”;C. until“直到”;D. since“自從;既然”。句意:很多人每天早晨鍛煉 _______ 惡劣的天氣阻攔他們。結(jié)合選項(xiàng)的意思和句意可知,用unless。故選B。26.We didn’t start our discussion __________ everybody arrived.A.since B.if C.while D.until【答案】D【解析】考查not…until…的用法。句意:直到每個(gè)人都到了我們才開(kāi)始討論。not…until…“直到……才……”;since“自……以來(lái);既然,由于”;if“如果”;while“雖然,當(dāng)……時(shí)候”。由句意可知選D。27.Martin and his friends didn’t eat up all the food they ordered, __ they took the rest away.A.for B.or C.so D.a(chǎn)s【答案】C【解析】【詳解】本題考查連詞的使用和區(qū)別。本題的含義為馬丁和他的朋友們不能吃完點(diǎn)購(gòu)的所有食物,因此他們把剩余的帶走。So表示所以的含義,表示結(jié)果引導(dǎo)結(jié)果狀語(yǔ)從句,與本題的含義相符;而for表示目的為了或表示原因因?yàn)榈暮x;or表示結(jié)果否則的含義,as表示作為或當(dāng)……時(shí)候的含義,后三者與本題的含義不符,故本題選C。28. ______ Mike didn’t win the race , he was still wearing a smile on his face.A.If B.Since C.Although D.Because【答案】C【解析】【詳解】句意:雖然邁克沒(méi)有贏了比賽,但是他臉上仍然帶著笑容。A. If 如果,引導(dǎo)條件狀語(yǔ)從句;B. Since 由于,引導(dǎo)原因狀語(yǔ)從句;C. Although 盡管,雖然,引導(dǎo)讓步狀語(yǔ)從句;D. Because 因?yàn)椋龑?dǎo)原因狀語(yǔ)從句。根據(jù)句意,故選C。 29.The two panies decided to work together ______ they had mon interest.A.because B.unless C.but D.or【答案】A【解析】【詳解】試題分析:句意:這兩家公司決定合作,因?yàn)樗麄冇泄餐睦?。前因后果,后面是表原因的狀語(yǔ)從句,用because連接。; B. unless 除非,表讓步;C. but但是,表轉(zhuǎn)折;D. or或者,表選擇。故選A??键c(diǎn):考查原因狀語(yǔ)從句的連詞 。30.The bell rang ________the teacher was explaining the experiment to the students.A.until B.before C.while D.a(chǎn)fter【答案】C【解析】句意“老師正向?qū)W生們解釋這個(gè)實(shí)驗(yàn),下課鈴聲響了?!眜ntil直到;before在……之前;while表示當(dāng)……時(shí)候,after在……之后。此處表示當(dāng)老師正講解實(shí)驗(yàn)時(shí),鈴聲響了,故用連詞while,故選C。