He failed in the exam, and I wonder he studied hard in the school.A. whenB. thatC. ifD. w

发布时间：2020-08-17 12:38:14

He failed in the exam, and I wonder      he studied hard in the school.
A. when
B. that
C. if
D. where

网友回答

A. when
B. that
(答案→)C. if
D. where
解析：本题failed是关键词，C项符合题意，意为：是否。
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