问题补充：
This kind of cup of paper.
A. makes
B. made
C. are making
D. is made
答案：
A. makes
B. made
C. are making
(答案→)D. is made
解析：句意：这种杯子是由纸制作的。be made of 由…组成，能够看得出原材料的，故选D
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