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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
考查情態(tài)動詞。should 應(yīng)該，must 必須，can 能，would 會，句意：因為在這沒有人知道這臺機(jī)器怎么了，我們必須派人請一個工程師來處理這個問題。所以選B。
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