【題目】They realized that the problem Ted put forward was difficult _______.

A.to solveB.solvedC.to be solvedD.solving

【答案】A

【解析】

考查非謂語動詞。句意:他們意識到泰德提出的問題很難解決。結(jié)合短語be difficult to do sth.“難以;很難……”后跟不定式,且在此結(jié)構(gòu)中,若主語與其后的不定式為動賓關(guān)系,那么該不定式習(xí)慣上要用主動形式表示被動意義。故用to solve形式。故選A。

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