单项选择题

A computer can only do ______ you have told it to do.

A. how
B. what
C. after
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单项选择题
One of my ______ came to see me on Sunday.
A. friend
B. friends
C. the friends
单项选择题
You look ______ today. What has happened to you
A. sad
B. sadly
C. sadder
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