问题补充：
— Is Jim coming by train? —I’m not sure. He drive his car.
A. must
B. may
C. need
D. Will
答案：
A. must
(答案→)B. may
C. need
D. Will
解析：句意：吉姆会坐火车来吗？我不确定。他可能会开他的车来。根据后面的回答I’m not sure.可知，应该是表示不确定的猜测；故选B。
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