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 was the matter with you this morning You looked () you hadn't slept for the last twenty four hours.

A. so as
B. that
C. as if
D. like that

单项选择题

—You've booked on a two o'clock flight.—What chance()of taking a later plane

A. there is
B. it is
C. is there
D. is it

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