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题型：单选题题类：真题难易度：普通

If you miss this chance, it may be years ____ you get another one.

A . As B . before C . since D . after

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组卷次数：155次 +选题

举一反三

You won't find it difficult ______ you have mastered it.

___________ he saw her, he fell in love with her.

_______ you consider that the airline handled 80 million passengers last year, the accident figures are really very small.

你可以借阅任何一本你喜欢的书。(whichever)

After she o{#blank#}1{#/blank#} her shyness, she became very outgoing.

几天前我正在网上冲浪，这时电脑突然坏了。(be doing...when...)

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