Some people called to complain___the net bars that were harming their children's studiesA.at B.for C.with D.about
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Some people called to complain___the net bars that were harming their children's studiesA.at B.for C.with D.about
Some people called to complain___the net bars that were harming their children's studies
A.at B.for C.with D.about
Some people called to complain___the net bars that were harming their children's studiesA.at B.for C.with D.about
d about
complain to somebody about something
如果是at后面应该是at the harm of the net bars
D 固定搭配 complain about sth.
D
complain about/of (sth./that...)固定搭配。