单项选择题

I was under the impression that he was a very slow boy（）he succeeded in writing a big book.

A. when
B. after
C. as
D. until

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单项选择题

A. He missed the appointment.
B. He arrived late.
C. He was sick.

单项选择题

A. She is at home.
B. She is taking a break.
C. She is attending a meeting.