问题

__, no one is sure whodiscovered America

A:If you don’t keep to
B:Keepingto
C:Tokeep to
D:Keep to

正确答案是：

同类题型

We were told that we should follow the main road ___ we reached the central railway station

He was not really in the mood for anything ______ it dawned on him that it had not been his fault.

____ apples are those—They are mine.

The mobile phone is out of date.—Why not try __________ Iphone 4.[ ]

Work hard, you’re sure to be successful in this exam.