[ Grammar ]
They _______ never explored a cave.
A. are
B. has
C. have
D. did
Select your answer:
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Grammar › ViewThe Universe always works ______________.
A. For our purpose
B. Without carefully
C. Ceaselessly
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As a comedian, he is no longer appreciated, but, ten years ago, people _____ at his jokes.
A. used to laugh
B. have been laughing
C. are used to laughing
D. have laughed
E. had laughed
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