—Lily, it's our _____ to clean the class

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问题选择题

—Lily, it's our _____ to clean the classroom.

—OK. Let's begin. [ ]

A. turn

B. turns

C. turning

D. to turn

答案

答案：A

选择题

－ Wow! You look different! You ______ wear glasses.

－ Yes, I did. But now I have had an eye operation. I can see clearly without them.

A．used to

B．were used to

C．had to

D．would

判断题

信用衍生产品可以降低信用风险，同时也可能增大信用风险。（）