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"Professor Smith,along with his assistants,_____ on the proj

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"Professor Smith,along with his assistants,_____ on the project day and night t"
"Professor Smith,along with his assistants,_____ on the project day and night to meet the deadline.
A.work
B.working
C.is working
D.are working"
"答案C
考查时态及主谓一致题.主语是单数时,尽管后面跟有 but ,except,besides,with ,as well as ,together with,along with,like 等引导的介词短语时 ,谓语动词与前面的主语一致.根据后面的day and night可知,需用现在进行时,故选C."