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9.Thechimneyisnolongergiving()volumesofwastegasintotheatmosphere,asprotectivefiltersarebeingused.(A)off(B)of(C)out(D)forth

题目详情
9.The chimney is no longer giving ( ) volumes of waste gas into the atmosphere,as protective filters are being used.
(A) off
(B) of
(C) out
(D) forth
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答案和解析
A