A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.

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问题 A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.

选项 A、before
B、until
C、since
D、when

答案A

解析题型：语法题。“It，s...before”句型表示“(……之后)才……”之意。until直到……为止，在否定句中多译为直到……才，该词一般不用在it is until肯定句型中。It is(has been)...since句型表示自……以来已有……时间了。

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专业英语四级

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A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.

专业英语四级

DICTATIONIt’sclearthateveryoneneedstosleep.Mostpeoplerarelythinkabouthowandwhytheysleep,however.Weknow

Duringthefamine,manypeoplewere______togoingwithoutfoodfordays.

Onesourceofapoorself-conceptisaninaccurateself-perception.Suchunrealisticpicturessometimescomefrombeingoverlyh

Accordingtotheprofessor,whatcanaspeakerdotokeepanaudience’sattention?

ThespaceshuttleDiscoverycompleteditsmissionforabout______daysbeforeitreturnedtoKennedySpaceCenter.

Thiswasapieceofnewsofgreatimportancetoeverymanandwomanwho______waitinganxiouslyoutsidethebuilding.

Theresidents,______hadbeendamagedbytheearthquake,weregivenhelpbythegovernment.

Manypeoplebelievetheglarefromsnowcausessnowblindness.Yet,darkglassesornot,theyfindthemselves【C1】______headaches

Shoalsoffishareabletomoveandturninseamlessformationbyfollowingsimplerulesthatarelikethoseusedbycardrivers

Longafterthe1998WorldCupwaswon,disappointedfanswerestillcursingthedisputedrefereeingdecisionsthatdeniedvictor

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空胶囊组成中各物质起什么作用A、成型材料B、增塑剂C、遮光剂D、防腐剂E、增稠剂羟苯乙酯

A．防止中毒B．防止爆炸C．防止腐蚀皮肤、黏膜D．防止烫伤E．防止损伤在用高氯酸时，应该

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患儿，6个月。因腹泻长期使用广谱抗生素。症见：满口白屑，状如雪花，不易擦去。应首先考虑的是

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