Computers ____ in offices and homes since 1970s.
| A．have been used | B．had been used | C．was used | D．has been used |
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I can’t ____ what has happened to the vegetables, for they were freshly picked this morning.
A. draw out B. look out 
figure out D. carry out
I will buy this type of car _____ the price is brought down to under 10,000 dollars.
A. even if B. provided that 
unless D. whether
Daniel’s family _____ their holiday in Huangshan this time next week.
A. are enjoying B. are to enjoy 
will enjoy D. will be enjoying
It’s quite ______ me why such things have been allowed to happen.
A. for B. against 
behind D. beyond
can’t have visited D. shouldn’t have visited相关知识点
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