[ Vocabulary and Grammar ]
The world is becoming more industrialized and the number of animal species that have become extinct ________ increased.
A. have
B. has
C. are
D. is
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Grammar › ViewA monkey _______ a long tail
A. has
B. had
C. have
D. having
Grammar › View
By the time he retired, he ________ for this company for more than twenty years.
A. is working
B. has been working
C. was working
D. had been working