单项选择题

A．after
B．until
C．by
D．during
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单项选择题
A．distanceB．varianceC．contrastD．difference
A．distance
B．variance
C．contrast
D．difference
单项选择题
A．They have to finish it quickly.B．They have to use what they have.C．They have to work hard and do their best.D．They must redo the project and hope it improves.
A．They have to finish it quickly.
B．They have to use what they have.
C．They have to work hard and do their best.
D．They must redo the project and hope it improves.
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