问题

When _______ you _______ to learn to ride your bike? — I really can’t remember the time.
A:do; begin
B:did; begin
C:have; begun
D:had; begun
B:did; begin
C:have; begun
D:had; begun
正确答案是:
同类题型
Mary_____ every day. She likes to do it.—So she is very healthy.
How long do you think it will be ______ the bus arrives here?– No more than five minutes.
Mr. Green didn’t post the letter _________. He asked his son to do it for him.
The World Table Tennis Championship began the morning of May 25, 2010 Moscow, Russia.
We’re happy that our country has developed _____ these years than before.