This problem may _______ more serious ones if left unsolved.
A．come acrossB．refer toC．carry on D．lead to
D
考查短語辨析。come across 偶然發(fā)現(xiàn)，refer to涉及，參考，carry on 繼續(xù)，lead to 導致，句意：這個問題可能會導致更嚴重的問題如果留下不被解決的話。所以選D。
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