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    3. I was about to leave _______ the telephone ran.

    　 A. before　　 B. as　　 C. while　　 D. when

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    2．My husband has lost so much weight that he has to wear a belt to ____ his trousers up.

    　 A. take　　 B. have 　　　C. get　　　 D. hold

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    1．It wasn’t long _______ he came back.

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

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