问题: 请教三道英语题？
4. The old lady was standing by the window ____ suddenly she caught sight of a postman riding along.
A. when
B. while
C. because
D. so
7. He ______ to win her love by sending her expensive gifts.
A. failed
B. damaged
C. proposed
D. attempted
16. It ____ over two years since the old gentleman first came to sample the puddings.
A. has been
B. was
C. will be
D. would be
解答:
选Ｂ，Ｄ，Ｄ
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