—What’s the matter with you? You look so worried.
-- I don’t know ___________ the problem.
A．what to solveB．how to solveC．to solve whatD．how can I
B

試題分析：根據(jù)上文句意，你怎么了？你看起來這么焦慮�！也恢廊绾谓鉀Q這個問題。What意思是什么，指具體事物。How是怎么怎樣的意思，指方式。根據(jù)題意可知這是說的是解決問題的方式，選項D缺少謂語動詞，故選B。
點評：英語中的疑問詞很多，需要加以區(qū)分牢記。
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