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f;故答案選B。18.She didn39。t leave the school __________ she worked out this problem.A.a(chǎn)s long as B.until C.since D.while【答案】B【解析】【詳解】句意“直到她解決了這個(gè)問(wèn)題他才離開(kāi)學(xué)?!薄#ㄒ龑?dǎo)條件狀語(yǔ)從句);(引導(dǎo)時(shí)間狀語(yǔ)從句);(引導(dǎo)時(shí)間狀語(yǔ)從句);……時(shí)候(引導(dǎo)時(shí)間狀語(yǔ)從句)。根據(jù)句意可知,譯為“直到他解決這個(gè)問(wèn)題他才離開(kāi)學(xué)校”。not...until...直到……才,故選B。19.______ many children like KFC, I think they’d better try not to eat it too often.A.Because B.When C.Although D.If【答案】C【解析】考查從句的知識(shí)。句意“盡管很多孩子喜歡吃KFC,單數(shù)我認(rèn)為他們最好不要經(jīng)常吃?!眀ecause引導(dǎo)原因狀語(yǔ)從句;when引導(dǎo)時(shí)間狀語(yǔ)從句;although引導(dǎo)讓步狀語(yǔ)從句;if引導(dǎo)條件狀語(yǔ)從句。題目表示的是讓步。故選C。20. Excuse me. Is it my turn now? Not yet. Please wait outside ________ your name is called.A.untilB.sinceC.so【答案】A【解析】句意: 打擾一下。 輪到我了嗎? 還沒(méi)。請(qǐng)?jiān)谕饷娴戎钡侥愕拿直唤械?。until用于肯定句中,意為“到…為止”,表示動(dòng)作一直持續(xù)到所說(shuō)時(shí)間為止,本句就是說(shuō)“到名字被叫到為之,請(qǐng)一直等待”,前半句和后半句中不存在因果關(guān)系,排除C,也沒(méi)有表示“自從”的意味,排除B,故選A。21. Can students go online during lessons? They can ________ it is for that lesson.A.ifB.orC.soD.but【答案】A【解析】句意:——學(xué)生可以在課上上網(wǎng)嗎?——如果是為了上課,他們可以上網(wǎng)??疾檫B詞辨析題。if如果,表?xiàng)l件;or或者,表選擇;so所以,表結(jié)果;but但是,表轉(zhuǎn)折。答句是條件狀語(yǔ)從句,需用if連接。根據(jù)句意結(jié)構(gòu),可知選A。22.He didn’t go to school yesterday _______ he was ill.A.because B.because of C.if D.so【答案】A【解析】【詳解】句意:他昨天沒(méi)去上學(xué),因?yàn)樗×恕1绢}的含義是昨天他沒(méi)有去上學(xué),“他病了”應(yīng)該是他沒(méi)上學(xué)的原因,because后跟原因從句,because of后跟單詞或短語(yǔ),if如果后接條件狀語(yǔ)從句,so因此。故選A。23.I think he’s been drinking, _________ I’m not pletely sure.A.if B.though C.until D.a(chǎn)s【答案】B【解析】if “如果、是否”;though “雖然;盡管”;until是“直到……才……”;as “由于、因?yàn)椤?。由上句“我認(rèn)為他一直飲酒”和下句“我不能完全確定”可知,兩者是讓步關(guān)系,用though引導(dǎo)讓步狀語(yǔ)從句。句意為“我認(rèn)為他一直在飲酒,盡管我不恩給你完全確定?!究键c(diǎn)】考查連詞意義辨析。24.Some children prefer to eat sweet chocolate _____ it’s not good for their health.A.because B.if C.when D.though【答案】D【解析】【詳解】句意:有些孩子喜歡吃甜巧克力,雖然這對(duì)他們的健康不好。考查從屬連詞辨析。A. because因?yàn)?;B. if假如;C. when什么時(shí)候;D. though雖然、盡管。根據(jù)