单项选择题

Even though the mother was asleep, she was unconsciously _____ her baby‘s cry.

A．listening
B．listening for
C．listening to
D．listening of
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单项选择题
A．negativeB．cheerfulC．variousD．complex
A．negative
B．cheerful
C．various
D．complex
单项选择题
Each rank in the army has a _____ sign to wear.
A．distinct
B．distinctive
C．clear
D．obvious
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