The set of stamps,once _______,will be very popular with sta

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The set of stamps,once _______,will be very popular with stamp-collectors.
A.to be printing
B.to print
C.printing
D.printed
我想知道具体原因,以及B为什么不正确.

D
once(they are ) printed 一旦印刷好
print 和逻辑主语the set of stamps 一套邮票是被动关系,所以用过去分词
表条件,一般用分词,不用不定式,所以不选B, 何况语态也不对
请采纳,不懂追问
*^__^* 谢谢!

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