单项选择题

Sometimes we can see ______ stars in the sky at night.

[A] thousand of
B. thousands of
C. thousand
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单项选择题
A bridge was built ______ the river.
[A] on
B. at
C. over
单项选择题
Is the man’s son badly ill
A. Yes, he is very iii.
B. No, he is very common.
C. Yes, but he can go home.
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