[ Tenses and Questions ]
What is the present perfect form of ‘to see’?
A. saw
B. has seen
C. seeing
D. sees
Select your answer:

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Grammar › ViewThe forest fire destroyed the whole suburb.
A. Active
B. Passive
Grammar › View
There are dozens of TV channels, ____________operate 24 hours a day.
A. some
B. some of which
C. some of those
D. some of them
