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【题目】People who can see with their eyes can’t understand _____ practical use Braille can be of for the blind.

A. howB. what

C. thatD. whether

【答案】B

【解析】

考查宾语从句。句意:能用眼睛看到的人无法理解盲文对盲人的实际用途。understand后面是宾语从句,从句缺少引导词和介词of的宾语,所填引导词要其双重作用,use在此是名词,用what表示“所……(的)”,修饰practical use,故答案选B。

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