单项选择题

The study group （）studying German for six months now

A. is   
B. has
C. was   
D. has been

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单项选择题
I （）at the company for a long time, so I know many people there

A. will be 
B. am   
C. been  
D. have been
填空题
Heaven and hell ______ in this world. (exist; are existing)
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