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As nobody here knows what is wrong with the machine, we          send for an engineer to handle the problem.
A.shouldB.mustC.canD.would
B
考查情态动词。should 应该,must 必须,can 能,would 会,句意:因为在这没有人知道这台机器怎么了,我们必须派人请一个工程师来处理这个问题。所以选B。
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