单项选择题

He () his mother a letter at that time.

A．is writing
B．was writing
C．will write
D．has written

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单项选择题
—May I come round in the morning -().

A．Yes, please come
B．So does he
C．So you do
D．Yes, please do
单项选择题
The idea came to me when I () with him.

A．talk
B．talked
C．was talking
D．have talked
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