单项选择题

（） are in the army.

A. Two their sons
B. Their two sons
C. Two sons their

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单项选择题
Their house is about （） as big as ours.

A. times three
B. three time
C. three times
单项选择题
At the age of （）, he had his own lab.

A. thirty
B. thirtieth
C. the thirtieth
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