She seldom (很少) speaks English after class, for she was afraid ________ mistakes ________ grammar.A.to make; ofB.making; ofC.to be made; inD.of making; in
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D解析解析：be afraid to do sth表示“不敢做某事”；be afraid of doing sth表示“生怕做某事”。根据题意“她课后很少说英语，因为她生怕犯语法错误。”可判断应用be afraid of doing，排除A、C两项；又因为B项be afraid后不能直接接doing，故为错误选项，可排除；又因“在某一方面犯错误”应用介词in，即make a mistake in...，故选D。