单项选择题

A．Useless.
B．Unnecessary.
C．Important.
D．Wasteful.
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问答题
When the dog reaches home, he________ but it proves in vain (徒劳).
单项选择题
A．Check the time of high tide.B．Go stand under the clock.C．Wait a little longer.D．Look for the traffic light.
A．Check the time of high tide.
B．Go stand under the clock.
C．Wait a little longer.
D．Look for the traffic light.
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