Scientists are doing research into this rare species, __________ natural ...

★ Relative Clauses and etc

Scientists are doing research into this rare species, __________ natural habitat is the bottom of the ocean.

A. where

B. which

C. whose

D. who

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‘Is Jackie a friend of yours?’

‘Yes, I __________ her for years.’

A. have been knowing

B. knew

C. know

D. have known