填空题

He is one of the boys who ______ (很难打定主意) in his class.

【参考答案】

have trouble (in) making up their minds

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单项选择题

According to Dr. Chiu, what makes it possible to track down any paper work is to ______.

A．make all the imperfections of machines deliberate
B．find out the guilty creator of the counterfeit document
C．allow more imperfectly designed printers to be sold
D．mark all the printers in a special and secret way

填空题

Now students have a variety of course choices when registering for an online learning no matter where they are.

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