问题
选择题
33. When a student asks_________it is worth staying up doing their lessons, a teacher may find it difficult to answer.
A．that
B．what
C．whether
D．How
答案
答案：C
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33. When a student asks_________it is worth staying up doing their lessons, a teacher may find it difficult to answer.
A．that
B．what
C．whether
D．How
答案：C