2．There are still many problemsto be solved （solve） before we leave．

分析 在我們之前仍然有許多問題需要解決．

解答 53．to be solved
答案是to be solved．考查非謂語動詞作定語．problems和solve之間是被動關系，且是還沒完成的動作，所以用被動語態(tài)的不定式形式to be solved作定語修飾名詞problems．故答案是to be solved．

點評 本題考查用所給單詞的適當形式填空．首先要根據(jù)語境明確句意，然后再根據(jù)相關語法對所給單詞在形式上做出正確的變動．

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