问题
选择题
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
答案
答案：D
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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
答案：D