题目内容

Professor Smith, along with his assistants, _________on the project day and night to meet the deadline.
A．workB．workingC．is workingD．are working
C
考查主谓一致。主语与along with 连用时不受其限制，谓语动词应与主语保持一致，题中主语为Professor Smith，所以谓语动词用单数形式，选C。
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