单项选择题

Monoculture forests planted in rows turned out to be extremely ______ to disease and to suffer from a gradual depletion of nutrients.

A. likely
B. prone
C. apt
D. liable
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单项选择题
He managed to escape from his captors two nights later, only ______ by an Arab and retaken by the Italians.
A. was betrayed
B. to be betrayed
C. being betrayed
D. to have been betrayed
单项选择题
We think it is high time the French government ______ responsibility for their citizens and should pay for this kind of damage.
A. should take
B. is to take
C. took
D. takes
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