单项选择题

Mr. Brown did not tell us ()or not he'll be leaving next week.

A. whether
B. if
C. either
D. weather

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单项选择题
The old woman burst into tears at the bad news () her son had been killed by the enemy.

A. that
B. when
C. which
D. what
单项选择题
Since we have never been here before, we do not know which bus().

A. should we take
B. to be taking
C. to take
D. should take
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