单项选择题

The cargo box has a label ______ on it. Please handle it with care. A . "flexible" B. "break" C. "fragile" D. "stiff"
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单项选择题
The team leader of mountain climbers marked out ______.
A．that seemed to be the best route
B．what seemed to he the best route
C．which seemed to he the best route
D．something that to be the best route
单项选择题
______there was an epidemic approaching, Mr. Smith ______ the invitation to visit that area.
A．If he knew, would have declined
B．If he had known, would decline
C．Had he known, would decline
D．Had he known, would have declined
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