【答案与详解】

1—79 略

80. B。before引导时间状语从句。It will be a long time before…的意思是“要过很久才会……”，如：It will be a long time before we finish this dictionary. 我们需要很长的时间才能把这部词典编完。It was a long time before I got to sleep again. 过了好久我才又睡着。

81. B。将四个选项逐一填入空格处，只有填when时，意思最通顺。句意为：当你昨天在布莱克先生办公室时我就带给你了。

82. D。比较：ever since意为“自从”，even if意为“即使”，soon after意为“在……之后不久”，in case意为“以防万一”。逐一填入空格，显然只有in case最合语境。句意为：给你的邻居留一把钥匙，以防万一哪天你把自己锁在外面。

83. B。once的意思是“一旦”，又如：Once you have taken this decision, there will be no going back, ie you will not be able to change your mind. 一旦作出这个决定，你就不能改变主意。Once you understand this rule, you’ll have no further difficulty. 一旦明白了这条规则，就再也没有困难了。

84. C。将四个选项的意思分别套入句中，只有填unless时意思最通顺。为便于理解，句子也可转换成：Most birds find it safe to sleep in the trees, but they don’t use a nest unless they have eggs or young chicks.

85. B。it was some time before…是一个很有用的句型，其字面意思是“在……之前过了一段时间”，通常可转译为“要过一段时间才会……”，如：It will be five years before we meet again. 五年以后再见。It may be a matter of months before it’s ready. 要准备好可能得数月时间。

86. A。unless的意思是“除非”，又如：Don’t call me unless you need help. 除非你需要帮助否则别打电话找我。Unless you change your mind, I won’t be able to help you. 除非你改变你的想法，否则我不能帮助你。

87. A。if在此引出一个虚拟条件。又如：If he had asked me, I would have had to tell him the truth. 如果他问我，我就不得不告诉他真相了。If I had not got married, I would still have been living abroad, 如果我没结婚，我就会仍然住在国外。

88. D。while在此表示“尽管”“虽然”，又如：While the work was difficult, it was interesting. 尽管工作有难度，但很有趣。/ While I understand what you say, I can’t agree with you. 虽然我理解你的意思，但我还是不同意。

89. A。until的意思是“直到……时”“在……之前”，如：We always have to wait until the last customer has left. 我们总得等着最后一位顾客离去。(from www.nmet168.com)

90. C。as if意为“好像”“似乎”，now that意为“既然”，even though意为“尽管”“虽然”，so that意为“为了”。比较四个选项，只有选C最合适。

91. C。in case意为“以防万一”，又如：I bought the car at once in case he changed his mind. 我马上买下了那辆汽车，以免他变卦。I don’t let him climb trees in case he tears his trousers. 我不让他爬树，以免撕破裤子。

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