单项选择题

That tree looked as if it（）for a long time.

A．hasn't watered
B．didn't water
C．hadn't been watered
D．wasn't watered

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单项选择题
I wonder if I can ask him（）time.

A．four
B．fourth
C．the fourth
D．a fourth
单项选择题
Such electronic devices（）are used in a radio set are also found in a computer.

A．which
B．that
C．what
D．as
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