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—I like your new leather boots!
—Thanks.I had to try on almost a dozen pairs ______ I decided to get them.
A.asB.whenC.afterD.before
D
介词辨析. A.当做   B.当……时候C.在……之后  D.在……之前。根据题意,谢谢。在我决定买它之前,我几乎试了十几双。故选D。
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