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A number of new functions ____ to the computer since it was first invented in 1946.
A. have added B. were added
C. have been adding D. have been added
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1.His film is sure to win the award because it ________ by most people.
2.Jack ________ his leg ________ when he was playing basketball yesterday.
3.________ to lose weight, he refused to eat chocolate.
4.After ________ high school, he went abroad for further study.
5.The doctor advised him ________ more outdoors activities.
6.He had much trouble ________ me for we had been apart(分开)for 10 years.
7.It was the second time that he ________ to give up smoking.
8.Some students stayed up late, ________ the coming examination.
9.We ________ the present situation in the Middle East.
10.A number of new functions(功能)________ the computer since it was first invented in 1946.