单项选择题

Today, computers are really helpful. They ______ everywhere.

A. used
B. are used
C. were used
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单项选择题
—______ is the book —It’s $12.50.
A. How old
B. How thick
C. How much
单项选择题
How old is Tom
A. 10.
B. 12.

C. 2.
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