问题

The difficult problems make him __________

A:studying hard
B:study hard
C:to study hard
D:studies hard;

正确答案是：

同类题型

下列各项中句式类型与其他三项不同的是（）

It is demanded that the plan _____ out as soon as possible.

I sent ______ e-mail to Amy to say thanks for her help with my study.

Shanghai is one of _______in China.

What do you think of the White House— Splendid. While I was studying in America, I it twice.