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
考查時(shí)態(tài)及主謂一致題。主語是單數(shù)時(shí)，盡管后面跟有 but ,except, besides, with ，as well as ，together with， along with，like 等引導(dǎo)的介詞短語時(shí) ，謂語動(dòng)詞與前面的主語一致。根據(jù)后面的day and night可知，需用現(xiàn)在進(jìn)行時(shí)，故選C。
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