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【单选题】

Don't _____. I'll help you.
[ ]

A.
worry
B.
worried
C.
be worry
D.
to worry
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参考答案:
参考解析:
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举一反三

【单选题】workers in the factoryover two thousand.

A.
The number of; is
B.
The number of; are
C.
A number of; is
D.
A number of; are

【单选题】Can you tell me ______ at that time? [ ]

A.
what were they doing
B.
what they were doing
C.
what are they doing
D.
what they are doing