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
The scientists ________ on the new medicine for two years. They will succeed in no time.
Where’syourpen?— It’s_____mypencilcase.[ ]
It’s Sunday tomorrow, so you _______ get up so early.
_________, but he wouldn’t listen to me.
Shenzhen _________ on the coast .— Yes . It is _________ the north of Hong Kong .