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Thelargehousesarebeingpainted,but.a.ofgreatexpenseb.atagreatexpensec.inalotofexpensesd.byhighexpense这个单选的答案是哪一个,为什么?

题目详情
The large houses are being painted,but ______.
a.of great expense b.at a great expense c.in a lot of expenses d.by high expense这个单选的答案是哪一个,为什么?
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答案和解析
B 固定词组