She can hardly avoid making mistakes in her homework, ______hard she tries.

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问题 She can hardly avoid making mistakes in her homework, ______hard she tries.

选项 A、for
B、as
C、how
D、however

答案D

解析 句中要求填入的具有两种功能:这个词必须是副词,能修饰副词hard;又同时是连接词,将前后两个句子在语法上联系起来。这个词非however莫属,因为它是连接副词。其他选项要么只是连词,要么只是副词。
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