One of the good things about the use of noise-killing system is _________ it saves the need for a silencer.?
A．whetherB．thatC．howD．why?
B?
本題主要考查表語從句中連接詞的選用。選項A表示不確定的語氣；選項B表示確定的語氣；選項C表示方式；選項D表示原因。根據(jù)句子內(nèi)容及語氣——陳述、肯定可知,本題的正確答案選B。
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