_____ .I don't know.

題目：

_____ .I don't know.
A.Whether it is raining or not.
B.If it is raining or not
C.Whether it were raining or not
D.If it was raining
選什麼啊,爲什麼?

解答：

A.Whether it is raining or not.
進行時態表將來
是否要下雨,我不知道.if表示是否的意思,不能用在句首.