单选题
By the time he leaves university, he _____ much working experience so long as he takes a part-time job.无
A、
has gained
B、
will have gained
C、
must have gained
D、
will gain
【正确答案】
B
【答案解析】
句意: 只要他做兼职, 他毕业时就会已经有丰富的工作经验了。 该句时态为将来完成时。
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