By this time next year, he ___ in Beijing for seven years.
A. has worked
B. has been working
C. will work
D. will have worked
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It ___ have been John that parked the car here, he is the only guy with a car.
A. may
B. can
C. must
D. should
Only in this way ___ her heart.
A. you win
B. can you win
C. you are able to win
D. will you able to win