Some keys _____ in Classroom 3F.Please ask the teacher _____ them.A.is;toB.are;forC.is;atD.are;on
问题描述：
Some keys _____ in Classroom 3F.Please ask the teacher _____ them.
A.is;to
B.are;for
C.is;at
D.are;on
答
B
有的钥匙在三楼的教室里面，请问老师要，
keys是复数用are，
ask sb for sth
答
选B.
第一个 主语是keys,这是复数,所以用复数are
第二个 ask sb for sth 跟某人要...东西