问题

Not until he retired from teaching three years ago ________ having a holiday abroad.

A:he had considered
B:had he considered
C:he considered
D:did he consider

正确答案是：

同类题型

Owen wouldn’t eat anything ________ he cooked ithimself.

The vegetables we ate for lunch ________ very goodThey had been overcooked

The government declared the ban____ everyone must go to the front.

Could I sit here—________. It’s Mr. Li’s seat.

Who on earth will take the place of him?— I’m afraid no one would like to ____ the challenge— It’s just too difficult a task. [ ]