题目内容：
4、（1分）Stamp collectors have paid $16,800 for ________.
A)
one Two Penny Blue
B)
twelve Two Penny Blues
C)
one One Penny Orange-Red
D)
fourteen One Penny Orange-Reds
参考答案：
选择题：4、（1分）Stamp collectors have paid $16,800 for _____
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Stamp collectors have paid $16,800 for ________.
A)
one Two Penny Blue
B)
twelve Two Penny Blues
C)
one One Penny Orange-Red
D)
fourteen One Penny Orange-Reds