题目内容
After Smith ________ for half an hour, he came to the conclusion that Helen was not coming.
A.has been waiting
B.waited
C.has waited
D.had been waiting
|
题目内容
After Smith ________ for half an hour, he came to the conclusion that Helen was not coming.
A.has been waiting
B.waited
C.has waited
D.had been waiting
|