问题

__the problem, he wouldn’t havecommitted those mistakes.

A:If he understood
B:Had he understood
C:When he had understood
D:If he would understood

正确答案是：

同类题型

Mr. Hall understands that _______ math has always been easy for him, it is not easy for the students.

rst time for everything is always themost exciting one. _____ it is your first day in a new job or going on a firstdate, you will always remember those “first” times.

Don’t play with the knife, _______ you’ll cut yourself.—-Sorry, I_________ .

I need ________ bananas to makefruit salad. Could you please buy some

The dog has a(n) _______ sense of smell while the rabbit has a sharp sense of hearing.