题目内容：
Computersin offices and homes since 1970s．A．wasB．had been usedC．have been usedD．has been used
参考答案：
单选题：Computersin offices and homes since 1970s．A．wasB．had been us..
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—Did Tom live here?—Yes，but he________here now. A．isn't ..
—Did Tom live here?—Yes，but he________here now. A．isn't liveB．hadn't livedC．isn't livingD．will live
It was the third time this term that the teacher________with..
It was the third time this term that the teacher________with the naughty student.A．had talkedB．have talkedC．talkedD．talk
He _________ to go through the hard times and finally became..
He _________ to go through the hard times and finally became a famous artist.A．succeededB．managedC．triedD．enabled
—The rain ________ fast and heavy.—You should ________ some..
—The rain ________ fast and heavy.—You should ________ some shelter. Look at you—you are all wet.A．is coming; findB．comes; have foundC．came; findD．came; have found
—I will pick you up at 6 tomorrow morning. —So early! I __..
—I will pick you up at 6 tomorrow morning. —So early! I _______ then.A．will sleepB．will have sleptC．will have been sleepingD．will be sleeping