问题
选择题
He failed in the exam, and I wonder ___ he studied hard in the school.
A．when
B．that
C．if
D．where
答案
答案：C
本题failed是关键词，C项符合题意，意为：是否。
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He failed in the exam, and I wonder ___ he studied hard in the school.
A．when
B．that
C．if
D．where
答案：C
本题failed是关键词，C项符合题意，意为：是否。