The library is only open at ________ times of the day. So you can’t get books an

题干

The library is only open at ________ times of the day. So you can’t get books any time you go there.

A．certain

B．usual

C．free

D．safe

上一题下一题 0.65难度单选题更新时间:2019-10-05 05:53:16

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