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一道英语单选advertisementisusefulinitletscustomersAnadvertisementisusefulinitletscustomersknowofthekindsofgoodsintheshops.A.thatB.whichC.whatD.whether

题目详情
一道英语单选 advertisement is usefulin _______ it lets customers
An advertisement is useful in _______ it lets customers know of the kinds of goods in the shops.
A.that B.which C.what D.whether
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答案和解析
in that 作为一个词组,意思是“在于,因为”,相当于because