问题

When ______ if he had any idea of what the novel was about, Jack just kept silent.

A:asking
B:asked
C:to ask
D:being asked

正确答案是：

同类题型

He must have been late for the conference yesterday, _______?

John was cleaning the window and Marywas watching TV.

You should get rid of ________ habit ofsmoking in ________ public

It _________ him half an hour to drive homeevery day last year.

She cared more about her students than her own healthThat’s why two years passed _____ she was treated for breast cancer