it will do us harm or good remains to be seen.A. IfB. WhetherC. ThatD. Where

问题补充：

. it will do us harm or good remains to be seen.

A. If

B. Whether

C. That

D. Where

答案：

A. If

(答案→)B. Whether

C. That

D. Where

解析：whether 引导主语从句，表示“是否”，if 不能引导主语从句