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(yǔ)從句中連接詞的選用。選項(xiàng)A表示不確定的語(yǔ)氣；選項(xiàng)B表示確定的語(yǔ)氣；選項(xiàng)C表示方式；選項(xiàng)D表示原因。根據(jù)句子內(nèi)容及語(yǔ)氣——陳述、肯定可知,本題的正確答案選B。
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