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根據(jù)題意,故選D。根據(jù)句意結(jié)構(gòu)和語境,可知before不合句意,故選A?!鼈円苍斐闪撕芏鄦栴}。28.Our head teacher often says, "You will not pass the exam ___________ you work hard."A.if B.unless C.since D.when【答案】B【解析】句意:我們的班主任常說:如果你們不努力學(xué)習(xí),你們就通不過考試。A.If如果; B.Though雖然,盡管; C.Unless除非。24.—Susan,what are the advantages of MP5 players?—Mom,they are smaller and lighter________they can be carried very easily.A.unlessB.ifC.untilD.so that【答案】D【解析】【詳解】句意:——Susan,MP5播放器的優(yōu)點(diǎn)是什么?——媽媽,他們更小、更輕,為的是方便攜帶。while表示一段時(shí)間,后面使用進(jìn)行時(shí)態(tài),主句是一般現(xiàn)在時(shí),可知從句使用現(xiàn)在進(jìn)行時(shí);故答案C。因此,本題的最佳選項(xiàng)是A。結(jié)合句意,故選B。前面意思是“他得掙好多錢”,后面意思是“他能夠給孩子們買好吃的和衣服”。結(jié)合句意,牛仔褲被發(fā)明了100多年,現(xiàn)在仍然流行。A. if 如果; B. though 盡管 C. for 因?yàn)?,為了? D. since自從;根據(jù)Little Jack has learned to do lots of things on his own , 和he is only four years ,所以用 though 引導(dǎo)讓步狀語從句;故選B18.________ jeans were invented over 100 years ago, they39。考查連詞用法。 will finish【答案】C【解析】【詳解】句意:貝蒂,你知道托尼是否要參加攝影比賽?他會(huì)的,如果他完成了有關(guān)澳大利亞的課題。15.—Betty, do you know if Tony ______ the photo petition?—He will, if he ______ his project on Australia.A.enters。句意:為了趕上末班車,我現(xiàn)在必須離開了。13.If you don’t go to the meeting tomorrow, ________ ?A.he will, too B.he won’t, either C.he does, too D.he doesn’t either【答案】B【解析】【詳解】句意:如果明天你不去開會(huì),他也不去。t realize he was a famous scientist you told me.A.until B.because C.since【答案】A【解析】句意:直到你告訴我,我才知道他是一位出名的科學(xué)家。故選D.考點(diǎn):考查連詞的用法。根據(jù)句意結(jié)構(gòu),可知選B。 so【答案】B【解析】【詳解】句意:雖然TFBOYS的成員還不到15歲,但許多人喜歡他們的歌曲。9._____ the members of TFBOYS are less than 15 years old, ______many people like their songs.A.Though。本題考查連詞。引導(dǎo)條件狀語從句;……時(shí)候(引導(dǎo)時(shí)間狀語從句);(引導(dǎo)讓步狀語從句);(引導(dǎo)時(shí)間狀語從句)。根據(jù)語境推測(cè)對(duì)話的語境是“——我想知道蒂娜下周是否會(huì)來中國。how long多長(問時(shí)間長短以及長度);when何時(shí); soon多久(后接一般將來時(shí),且用in+一段時(shí)間回答);how often多久一次(問頻率)。 until B.When。此題考查連詞,A因?yàn)?;B因?yàn)椋籆自從;D盡管。we can go out for a big meal表示目的的完整句子,所以使用連詞詞組so that