18．All the time must be made full use of __________．（　　）
A．studying hardB．to study hard
C．be studying hardD．to be studied hard

分析 所有的時間都必須充分利用來努力學習．

解答 答案：B 考查動詞不定式．此處用動詞不定式表示目的．A項：動名詞，容易錯當成make full use of的賓語；C項：沒有這種表達形式；D項：不定式的一般被動式，此處要用主動式．

點評 動詞不定式具有名詞、形容詞和副詞的特征，因此，在句中可以作主語、表語、賓語、賓語補足語、定語和狀語．第一步，分析句子的語態(tài)，根據(jù)主語與動詞的關(guān)系判斷該句是主動句還是被動句；第二步，判斷動詞的時態(tài)和單復數(shù)．如果是主動句（主語是動作的施行者），就判斷動詞的時態(tài)，直接寫出動詞的時態(tài)即可．

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