单项选择题

—How long have you been ill —______（）.

A．Since last week
B．A week ago
C．Once a week

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单项选择题

We won't go to the Great Wall if it （） tomorrow.

A．rains
B．rain
C．will rain

单项选择题

When I came into the classroom, the teacher （） something on the blackboard.

A．is writing
B．was writing
C．wrote

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