She was afraid _____ the dog in case it became dangerous .
A．of excitingB．to exciteC．that she excitedD．to be exciting
B
be afraid后面既可以跟不定式be afraid to sth又可以跟動名詞be afraid of doing sth , 但前者的意思是：害怕/不敢做某事；后者的意思為：對可能出現(xiàn)的結(jié)果的發(fā)愁或憂慮，試比較以下兩個句子：She was afraid to wake up her husband . ( perhaps because she feared that he would be annoyed or angry ) 她不敢喚醒她的丈夫。（可能因為她害怕他會不高興或生氣）
She was afraid of waking up her husband . ( perhaps because he was ill , or in need of extra sleep )她擔心吵醒了她的丈夫。（可能因為他生病了或需要一些額外的睡眠）
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