单项选择题

His failure in the experiment suggested that he ______ his teacher's proper instructions.

A．should not have followed
B．should not follow
C．mustn't have followed
D．hadn't followed
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单项选择题
While people may refer to television for up-to-the-minute news, it is unlikely that television ______ the newspaper completely.
A．replaced
B．have replaced
C．rel61ace
D．will replace
单项选择题
______ arriving at the burning building, the fire fighters at once joined the local residents in the fight against-the big fire.
A．On
B．For
C．At
D．In
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