--I’d like to invite you to a concert this evening.--Thank you, but ______ I’ll be free I’m not sure at that moment.

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问题 --I’d like to invite you to a concert this evening.--Thank you, but ______ I’ll be free I’m not sure at that moment.

选项 A、while
B、if
C、when
D、whether

答案D

解析本句的正常语序为but I’m not sure whether I’ll be free at that moment．意为“我不能确定到时是否有空。”whether和if都能引导宾语从句，跟在作表语的形容词后作宾语，但if作“是否”解时一般不能用于句首。

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