问题:
The urge to go abroad for further study is strong, but it was not until last summer ________ I knew how powerful it could be.
A.who
B.that
C.where
D.before
The urge to go abroad for further study is strong, but it was not until last summer ________ I knew how powerful it could be.
A.who | B.that |
C.where | D.before |
参考答案: