问题
选择题
This robot is supposed to save a lot of labor, but it remains a problem if it ______.
A．is
B．saves
C．does
D．has
答案
答案：C
do(es) 是代动词，用来代替上文save a lot of labor。
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This robot is supposed to save a lot of labor, but it remains a problem if it ______.
A．is
B．saves
C．does
D．has
答案：C
do(es) 是代动词，用来代替上文save a lot of labor。