I saw John in the park this morning．
It _____ be him． He has gone to HongKong．（ ）
A．can'tB．canC．mustn'tD．must
I saw John in the park this morning．
It _____ be him． He has gone to HongKong．（ ）
A．can'tB．canC．mustn'tD．must
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