问题
It is by no means clear ________ the president can do something to end the strike
A:whether
B:which
C:that
D:what
B:which
C:that
D:what
正确答案是：
同类题型
We’d better go downstairs right now for lunch—__________ They serve food 24 hours a day
He often thinks things before he makes a decision.
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At no time ________ the rules of the game It was unfair to punish them