问题
选择题
We worried about ______ he was in good health.
A．whether
B．if
C．that
D．what
答案
A
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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We worried about ______ he was in good health.
A．whether
B．if
C．that
D．what
A
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。