.Most birds find it safe to sleep in the trees, but __________ they have eggs or
题型:不详难度:来源:
.Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they don’t use a nest. A.why | B.how | C.unless | D.where |
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答案
C。 |
解析
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. |
举一反三
. He was told that it would be at least three more months __________ he could recover and return to work. A.when | B.before | C.since | D.that |
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.I won’t call you, __________ something unexpected happens. A.unless | B.whether | C.because | D.while |
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.__________ he had not hurt his leg, John would have won the race. A.If | B.Since | C.Though | D.When |
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. It is difficult for us to learn a lesson in life __________ we’ve actually had that lesson. A.until | B.after | C.since | D.when |
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.Many of them turned a deaf ear to his advice, __________ they knew it to be valuable. A.as if | B.now that | C.even though | D.so that |
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