问题描述：
3.The old man was afraid _____ the bridge because he was afraid _____ into the river.
A.to cross; of falling
B.to cross; to fall
C.of crossing; to fall
D.of crossing; of falling
A.to cross; of falling
B.to cross; to fall
C.of crossing; to fall
D.of crossing; of falling
问题解答：
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