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Hemetmanyproblems      hewasgoingoverhislessons.A.befor...

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問題詳情:

Hemetmanyproblems      hewasgoingoverhislessons.A.befor...

He met many problems       he was going over his lessons .

A. before      B. as soon as      C. since     D. while

【回答】

D

知識點:連詞

題型:選擇題