问题

For a long time, he hesitated whether he should tell us ____ what had happened

A:at dusk
B:at length
C:at present
D:at stake

正确答案是：

同类题型

I’ll go to the library ____________ some books .

Li Fan won the first prize in the national physics competition. — I ________ he was the winner.

our surprise,he got the first place in the game!

Seen from space, the earth looks like a blue ball, with __________ 75% of its surface covered with water [ ]

Shall I help you?—Sure. Such a difficult case is ______ I could handle myself.