He was afraid ________ across the wooden bridge because he was afraid ________ into the river.A.to walk; of fallingB.to walk; to fallC.of walking; to fallD.to walking; falling
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A解析解析：本题考查be afraid的用法。to后应接动词原形，可排除D项。be afraid后接to do与of doing均可表示“害怕……”，故第一空用to do或of doing均可；第二空表示“担心掉进河里”，只可用be afraid of doing，故选A。