问题

What about your study–I found very difficult all the subjects well.

A:at; on
B:for; in
C:for; on
D:on; on;

正确答案是：

同类题型

She can play ______ piano(钢琴) well.

下列各句中，没有语病的一句是（）

scovery was made in the 1950s, while the ________ of it was not recognized until half a century later.

Once one’s desire ______ reason, trouble is sure to follow.

Tom’s mother was _________ angry at the news that she could hardly say a word