9．We _____ worry so much about him．He is old enough to take care of himself at college．（　�。�
A．couldn'tB．mustn'tC．needn'tD．daren't

分析 我們不必這么為他擔(dān)心．他年齡已經(jīng)夠大，能夠在學(xué)校照顧自己．

解答 答案是C．本題考查情態(tài)動(dòng)詞辨析；couldn't不可能，不能；mustn't禁止；needn't不必；daren't不敢；根據(jù)句意選C．

點(diǎn)評(píng) 要在正確理解情態(tài)動(dòng)詞的基本含義的基礎(chǔ)上，整體理解語境中的情感態(tài)度，做出合理的判斷．

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