-I’d like to invite you to my birthday party this evening. -Thanks, but I’ll hav

—I’d like to invite you to my birthday party this evening.

—Thanks, but ____ I’ll have time I’m not sure at the moment.

A. while       B. whether        C. if       D. when

试题答案

B

解析:

宾语从句前置用what不用if，目前我不确定是否有时间，故选B。