We worried about ______ he was in good health.A、whetherB、ifC、thatD、whatA我们担心

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问题 We worried about ______ he was in good health.

选项 A、whether
B、if
C、that
D、what

答案 A

解析我们担心他是否健康。介词的宾语从句只能用whether引导，不能用if。

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