单项选择题

Selecting a mobile phone for personal use is no easy task because technology ()so rapidly．

A．is changing
B．has changed
C．will have changed
D．will change

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单项选择题
John was made ()the truck for a week as a punishment.

A. to wash
B. washing
C. wash
D. to be washing
单项选择题
—What were you doing when I called you yesterday afternoon —I()my homework and I was starting to take a bath.

A. had just finished
B. was finished
C. have already finished
D. was going to finish
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