问题
It’s a pity that Wang Qiang failed in the driving test again.—How can you expect him to pass _______ he hasn’t been practicing enough?
A:when
B:once
C:unless
D:though
B:once
C:unless
D:though
正确答案是：
同类题型
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Once we _____ some knowledge, things do not become more difficult, but comprehensible.[ ]
It is difficult me _______ English well. But I’ll study harder.