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编辑Many provinces have been hit with smog．If _______ unsolved, the problem may lead to more serious results.
Many provinces have been hit with smog. If _______ unsolved, the problem may lead to more serious results.
Many provinces have been hit with smog. If _______ unsolved, the problem may lead to more serious results.
...更多
A.
having left
B.
to leave
C.
left
D.
leaving
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