Ever since my brother graduated from the university, he _______ in the present company for 15 years and he is now chief engineer of the company  . 
#100037
A
worked
B
has been working
C
is working
D
works
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Life abroad was not easy for him, and it was several years before he ________ the whole community.
#102091
A
had been familiar with
B
got familiar with
C
have been familiar with
D
would be familiar with
Tom has been absent for two days.Do you know what _________ to him?
#103347
A
has happened
B
would happen
C
was happened
D
had happened