This robot is supposed to save a lot of labor, but it remains a problem if it . A. isB. sa

发布时间：2020-08-14 23:10:04

This robot is supposed to save a lot of labor, but it remains a problem
if it     .
A. is
B. saves
(答案)C. does
D. has

网友回答

@@A. [email protected]@B. [email protected]@(答案)C. [email protected]@D. has
do(es) 是代动词，用来代替上文save a lot of labor。
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