单项选择题

He must have had an accident, or he ______ then.

A. would have been here

B. had to be here
C. should be here

D. would be here
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单项选择题
Hill slopes were cleared of trees to make way for crops, but this only ______ the crisis.
A. preceded
B. prevailed
C. ascended
D. accelerated
单项选择题
The manager tried to wave aside these issues as ______ details that would be settled later.
A. versatile
B. trivial
C. preliminary
D. alternate
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