16..All of us know  _______ difficult the problem may be,we must work _____ out this evening.( 。
A.what; itB.whatever; thatC.how; thatD.however;it

分析 我們都知道不管這個(gè)問題多么難,我們必須今晚解決.

解答 答案是D.本題考查從句引導(dǎo)詞;動(dòng)詞know引導(dǎo)的賓語從句中又出現(xiàn)了讓步狀語從句;從句中第一空需要的是引導(dǎo)讓步狀語從句修飾形容詞difficult的副詞,故排除A和B;根據(jù)語境"無論多么困難",故第一空選用however;第二空需要的是代替"the problem"的代詞it,故答案是D.

點(diǎn)評(píng) 從句引導(dǎo)詞的判斷先要搞清從句的性質(zhì),掌握各引導(dǎo)詞的用法,最后結(jié)合語境做出符合語法規(guī)則和邏輯的判斷.

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