问题描述：
He is afraid _______the narrow bridge because he is afraid _______ into the water.
A.to cross,of falling B.of crossing,to fall C.to cross,to fall D.of crossing,of falling为什么选A
be afraid用法是什么
A.to cross,of falling B.of crossing,to fall C.to cross,to fall D.of crossing,of falling为什么选A
be afraid用法是什么
问题解答：
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