单项选择题


A．which
B．what
C．how
D．that
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单项选择题
A．fellowsB．shiftC．workersD．colleagues
A．fellows
B．shift
C．workers
D．colleagues
单项选择题
It seems that Mars ______.
A．may be inhabited by attractive Martians
B．may have some vegetable life
C．can have no life at all
D．may have both vegetable and animal life
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