中文谷Hemetmanyproblems
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問題詳情：
He met many problems______he was going over his lessons.
A. before B . while C. since
【回答】
B
知識點：連詞
題型：選擇題
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問題詳情：
He met many problems______he was going over his lessons.
A. before B . while C. since
【回答】
B
知識點：連詞
題型：選擇題
