【正文】
進行時,從句使用一般過去時;while當……時候,而;until直到;after在……以后。短語“not… until…”:直到……才……;結合句意可知選C。25.—Tom, you look tired this morning. What’s wrong?—I was so busy that I didn’t go to bed _____ 12 o’clock last night.A.until B.when C.though D.unless【答案】A【解析】本題符合notuntil的結構,表示直到才,故選答案為A26.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:如果你們不努力學習,你們就通不過考試。If如果,引導條件狀語從句;unless除非,引導條件狀語從句;since自從,因為,引導時間狀語從句;when當……時候,引導時間狀語從句;條件狀語從句用一般現(xiàn)在時表示一般將來時,主句用一般將來時,根據(jù)題中的時態(tài)和句意,如果不努力,就通不過考試,故此處用unless。故選B。27.—Did you catch the early bus this morning? —Yes. The bus started to move _ I got on it.A.though B.before C.a(chǎn)s soon as D.a(chǎn)s if【答案】C【解析】句意:你今天早上趕上早班車了嗎?——是的。我一上車,車就開動了。though盡管,引導讓步狀語從句;before在……之前,不符合對話的意思;as soon as一……就;as if猶如,好像。結合下面的回答Yes,說明說話人趕上了早班車,所以選C。28.Henry will give us a report as soon as he _______.A.a(chǎn)rrives B.a(chǎn)rrived C.is arriving D.will arrive【答案】A【解析】【詳解】句意:亨利一到,他就要給我們做一個報告。當主句描述將來動作時,英語條件狀語從句中用一般現(xiàn)在時態(tài)表示將來的動作;主語單三,謂語動詞用單數(shù)形式;故選A。29.Cathy is afraid of the dog. She will run away _______she sees it.A.ever since B.a(chǎn)lthough C.a(chǎn)s soon as D.so that【答案】C【解析】【詳解】句意:凱西害怕狗,她一看到狗就跑了??疾檫B詞辨析。A. ever since自從;B. although雖然、盡管;C. as soon as一…就;D. so that以便;所以。根據(jù)Cathy is afraid of the dog. 凱西害怕狗,可推知是她一看到狗就跑開了,結合選項可知C選項符合題意,故答案選C。30._____there was no obvious evidence, most people didn’t think he was guilty of the robbery.A.When B.While C.Since D.As【答案】C【解析】【詳解】句意“由于沒有明顯的證據(jù),大多數(shù)人認為他沒有犯搶劫罪”?!瓡r候(引導時間狀語從句);……時候(引導時間狀語從句);“因為”、“既然”,側重主句,從句表示顯然的或已為人所知的理由,語氣比because稍弱;D. as因為,表示的“原因”是雙方已知的事實或顯而易見的原因,或者理由不是很重要。根據(jù)句意可知,因為沒有明顯的證據(jù),且這個理由很重要,所以人們認為他沒有犯搶劫罪,故選C