_______ him this time is difficult.
A．To refuseB．RefusingC．RefuseD．Refused
A

試題分析：考查不定式做主語。CD不能做主語。不定式做主語指具體的一次性行為。動名詞做主語表示經(jīng)常性習(xí)慣性行為。本句指這次拒絕她，是一次性的行為，故使用不定式做主語。句意：這次拒絕他很困難。故A正確。
點(diǎn)評：不定式做主語時表示一次性具體的行為，動名詞做主語時表示經(jīng)常性習(xí)慣性的行為。
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