问题

He had no idea of how the climb would be _______ he was half way up the mountain.

A:when
B:until
C:while
D:as

正确答案是：

同类题型

The number of people who can afford to buy their own houses ________ more than 80%, but a number of houses _________.

_______ she studies hard, ________ the girl still can’t get good grades.

, you play so well. But I__________ you played the piano.

It is not_______ for me to return all thebooks to the library now because I still need them.

ets done _______ when people do ittogether,and the rewards are higher too.