[ Present Perfect: for/since ]
Charlie ____ (do) the ironong ____ 30 minutes.
A. has done/ for
B. have do/ for
C. has done/ since
D. has done/ since
Select your answer:
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Vocabulary › ViewMathematical geneticists showed that the gene frequency change by __________ is much smaller than the change by natural selection.
A. mutation
B. forest fire
C. invisible
D. vision
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to throw out or get rid of
A. discard
B. remorse
C. exuberant
D. profound