Professor Smith, along with his assistants, ________ on the project day and night to meet the deadline.
A．workB．workingC．a(chǎn)re workingD．is working
D
考查主謂一致。along with連接兩個(gè)主語(yǔ)，謂語(yǔ)動(dòng)詞根據(jù)前一個(gè)主語(yǔ)決定，故用單數(shù)，選D。
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