单项选择题

Bob caught a bad cold as he ______ in the heavy cold rain the day before yesterday.

A．was caught
B．caught
C．was being caught
D．had been caught
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单项选择题
Many a plan ______ to fight against pollution.
A．have been worked out
B．have been worked on
C．has been worked out
D．has been worked on
单项选择题
Both his brother and his sister ______ busy with their homework.
A．is
B．are
C．am
D．be
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