Look at the stars. Can you count them clearly?-No. There are stars in the sky. A. two billions B. two billions of C. billions of D. two billion of 题目和参考答案——青夏教育精英家教网—

( ) 7. Look at the stars. Can you count them clearly?

—No. There are stars in the sky.

A. two billions B. two billions of

C. billions of D. two billion of

7. C

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