单项选择题


A．after
B．in front of
C．behind
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单项选择题
A．close and closeB．closer and closerC．bigger and bigger
A．close and close
B．closer and closer
C．bigger and bigger
单项选择题
A．A few minutes laterB．At onceC．After an hour
A．A few minutes later
B．At once
C．After an hour
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