单项选择题

He ______ when I came into his room last night.

A．was singing
B．sang
C．sings
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单项选择题
When we saw his face, we knew ______ was bad.
A．some news
B．a news
C．the news
单项选择题
Study English hard, ______ you'll fail the exam.
A．or
B．so
C．and
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