The stamps, once , will be very popular with stamp-collectors.A. being printedB. printingC

发布时间：2020-08-29 23:10:15


The stamps, once     , will be very popular with stamp-collectors. 
A. being printed
B. printing
C. to print
D. printed

网友回答

A. being printed
B. printing
C. to print
(答案→)D. printed
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