问题
He lost a set _____ keys.[ ]
A: of
B: at
C: in
D:on
B: at
C: in
D:on
正确答案是：
同类题型
My best friend Liu Fang is _____ my left.[ ]
This kind of MP5 is my favourite, but I can’t________ it.
How glad we are! Miss Li will teach _______ English this term.
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