单项选择题

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

A．how
B．after
C．what
D．when
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单项选择题
--What were you up to when she dropped in--I ______ for a while and ______ some reading.
A．was playing, was going to do
B．played, did
C．had played, was going to do
D．had played, did
单项选择题
--Guess what! I came across an old friend at the party last night.-- ______ I am sure you had a good time.
A．Sounds good!
B．Very well.
C．How nice !
D．All right.
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