问题

What we really concern is _____ those orphans canrecover from the earthquake psychologically.

A:that
B:if
C:why
D:whether

正确答案是：

同类题型

Most volunteers are from universities, _________ it is not uncommon to see middle and primary school students too

Regulations require__________needs special diets the cooking manager in advance.

下列各句中加横线词语的意义和用法不相同的一项是（）

Just as sound travels through the air in waves, electricity travels through the air in ______ radio waves.

Mike promised ______ hard from now on.