Many problems concerning the improvement of our school remain ________.
A．solvingB．solvedC．to solveD．to be solved
D
考察非謂語動詞。句意：有關(guān)改善我們學(xué)校的許多問題仍舊有待解決。不定式做表語表示具體的將要進(jìn)行的動作，本句中句子主語是解決的對象，故用被動語態(tài)的不定式，選D。
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