Professor Smith, along with his assistants, _________on the project day and night to meet the deadline.
A．workB．workingC．is workingD．a(chǎn)re working
C
考查主謂一致。主語與along with 連用時(shí)不受其限制，謂語動(dòng)詞應(yīng)與主語保持一致，題中主語為Professor Smith，所以謂語動(dòng)詞用單數(shù)形式，選C。
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