沈阳科技馆路线:帮忙解答!!!谢谢

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where's Jim?
I hear his voice a moment ago.He___be near here.
A.must
B.need
C.mustn't
D.needh't

where's Jim?
I hear his voice a moment ago.He___be near here.
A.must
B.need
C.mustn't
D.needh't
答案是a,应为前面说,我刚刚还听到他的声音,那么现在他一定在附近。
另外:must be 否定形式needn't在这里,d答案语法没错,逻辑上有错误。b and c都不对!

must

明显的,有疑问???