问题

____ in the queue for half an hour, the old man suddenlyrealized he had left the cheque in the car. [ ]

A: Waiting
B: To wait
C: Having waited
D: To have waited

正确答案是：

同类题型

They decided not to climb the mountain because it was raining _____.

I’m ____ heavier than my brother.

Do you know him—I’m sure I’ve seen him _____, but I can’t remember the right place.

下列句中“所以”的用法与其他三项不相同的一项是（）

It is ______ for her to finish that maths problem in such a short time, because she is so clever.[ ]