问题

What the doctor really doubts is ______ my mother willrecover from the serious disease soon.

A:when
B:how
C:whether
D:if

正确答案是：

同类题型

Hush! The baby is sleeping, please talk ______than usual or you may wake him up.

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Is this your pencil —No, ______ is here. I think it’s Yang Hua’s.

Not only his family but also heChaplin’s movies.

Daddy, do you have a _________—Sorry dear, I would ________ listen to your story now. but you see this endless housework