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

We can see monuments here and there. Thosewho have made great ________to human beings and society will never beforgotten.

It is believed ______ children should learn to be responsible from the very beginning．

Mum,may I go out to fly kites-Sorry.Please don’t go out___________your work is finished.

_, Sharon couldn’t find her lost wallet.

They have mostcarefully the time and money needed to complete the project