单项选择题

21（）

A．worth
B．spent
C．worthy
D．used

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单项选择题
She began to ______ something but stopped when she heard the teacher
A．tell... saying
B．speak... talking
C．say... speaking
D．talk... telling
单项选择题
The water will be further polluted unless some measures ______.
A．will be taken
B．are taken
C．were taken
D．had been taken
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