问题

If his parents are convinced the fact that his son always focuses his mind _his study

A:of; on
B:of; at
C:by; to
D:on; at

正确答案是：

同类题型

I’m very happy that I didn’t fail my Maths test ______In fact I got one of the top scores in the class[ ]

We will only discuss such problems___________something to do with our own interests

Tom very happy. He must have passed the test.

__________ you trust him, you may as well follow his advice

We made Tom __________ director of the department.