单项选择题

()you don't know the rule won't be a sufficient excuse for your failure.

A. It is
B. That
C. Because
D. What

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单项选择题
While he was climbing the high mountain, he had his leg().

A. broke
B. break
C. broken
D. breaking
单项选择题
My mind wasn't on what he was saying so I'm afraid I () half of it.

A. was missing
B. had missed
C. will miss
D. missed
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