问题

The scientist’s many years’ careful observation ____ a surprising discovery.

A:ran into
B:began with
C:led to
D:came from

正确答案是：

同类题型

Xi’anis one of capitalin China.

English has a large vocabulary, _______?—Yes. Know more words and expressions and you will find _______ easier to read and communicate.

I soon found that the work I was doing had already been done by someone else -_____, I was wasting my time.[ ]

What we expect from you is working hardhardly working.

Wouldn’t it be ____ wonderful world if all nationslived in ____ peace with one another