Tom       in the library every night over the last three months.
A．worksB．workedC．have been workingD．had been working
C
考查考察時(shí)態(tài)，題干中出現(xiàn)的over the last three months，用于現(xiàn)在完成進(jìn)行時(shí)或現(xiàn)在完成時(shí)。
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