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(shí)間都必須充分利用來(lái)努力學(xué)習(xí)．

解答 答案：B 考查動(dòng)詞不定式．此處用動(dòng)詞不定式表示目的．A項(xiàng)：動(dòng)名詞，容易錯(cuò)當(dāng)成make full use of的賓語(yǔ)；C項(xiàng)：沒(méi)有這種表達(dá)形式；D項(xiàng)：不定式的一般被動(dòng)式，此處要用主動(dòng)式．

點(diǎn)評(píng) 動(dòng)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(yǔ)、表語(yǔ)、賓語(yǔ)、賓語(yǔ)補(bǔ)足語(yǔ)、定語(yǔ)和狀語(yǔ)．第一步，分析句子的語(yǔ)態(tài)，根據(jù)主語(yǔ)與動(dòng)詞的關(guān)系判斷該句是主動(dòng)句還是被動(dòng)句；第二步，判斷動(dòng)詞的時(shí)態(tài)和單復(fù)數(shù)．如果是主動(dòng)句（主語(yǔ)是動(dòng)作的施行者），就判斷動(dòng)詞的時(shí)態(tài)，直接寫出動(dòng)詞的時(shí)態(tài)即可．

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