The manager along with his workers _______ day and night to complete the project.
A．have workedB．workC．is workingD．a(chǎn)re working
C
考查主謂一致。along with連接兩個(gè)主語，從句的謂語動(dòng)詞與前一個(gè)主語保持一致，選C。
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