问题

So fast ________ that I could not catch up with them. [ ]

A: did they run
B: they had run
C: they ran
D: had they run

正确答案是：

同类题型

A lot of trees _____ around here every year, and we can enjoy fresher air now.

The China National Environmental Monitoring Center ____ air quality in urban areas from levels one to five: excel-lent, fairly good, slightly polluted, poor and dangerous.[ ]

winner, who might be the luckiest,was a housewife.

He is tall and strong.

下列各句中，没有语病的一句是