33. To keep your teeth clean, you must brush them ______ you go to bed.(A) after (B) when (C) before

問題詳情

33. To keep your teeth clean, you must brush them ______ you go to bed.
(A) after
(B) when
(C) before
(D) although

參考答案

答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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