问题
选择题
We are worried about ____ they can be rescued.
A．that
B．whether
C．if
D．what
答案
答案：B
考查名词性从句。句中whether引导宾语从句，介词后不可用if。句意：我们担心他们是否能够被解救。
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We are worried about ____ they can be rescued.
A．that
B．whether
C．if
D．what
答案：B
考查名词性从句。句中whether引导宾语从句，介词后不可用if。句意：我们担心他们是否能够被解救。