【題目】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】

考查賓語從句。句意：能用眼睛看到的人無法理解盲文對盲人的實際用途。understand后面是賓語從句，從句缺少引導詞和介詞of的賓語，所填引導詞要其雙重作用，use在此是名詞，用what表示“所……（的）”，修飾practical use，故答案選B。

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