问题

______ I admit that there are problems, I don’t agree that they cannot be solved.
A:As
B:If
C:While
D:When
B:If
C:While
D:When
正确答案是:
同类题型
There is no possibility _____ he will keep his word.He is always telling lies.[ ]
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A smile costs __________, but it gives so much. So we should learn to smile.
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