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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Our slogan is Quantity should never be increased at the () of quality .

A. price
B. cost
C. value
D. wealth
单项选择题
Let's ask him for help, ().

A. don't we
B. shall we
C. have we
D. haven't we
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