单项选择题

Their house is about （） as big as ours.

A. times three
B. three time
C. three times

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单项选择题

At the age of （）, he had his own lab.

A. thirty
B. thirtieth
C. the thirtieth

单项选择题

We will have a （） holiday. What about going to Suzhou.

A. five days
B. five day
C. five-day

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