32．from lightweight materials，the robots are about the size of a human arm or smaller．A. T

发布时间：2020-08-16 06:18:04


32．    from lightweight materials，the robots are about the size of a human arm or
smaller．
A. To build
B. Being built
C. Having built
D. Built

网友回答

A. To build
B. Being built
C. Having built
(答案→)D. Built
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