单项选择题

They didn't realize how serious the problem was.

A．know
B．forget
C．doubt
D．remember
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单项选择题
The nursery is bright and cheerful.
A．pleasant
B．clean
C．peaceful
D．large
单项选择题
She was grateful to him for being so good to her.
A．careful
B．hateful
C．beautiful
D．thankful
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