[ Passive Voice ]
Electricity ….. Edison
A. was discovered by
B. was invented by
C. was designed by
D. was based on

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Grammar › ViewFolk artists have ………….. or no formal art training.
A. few
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Grammar TOEFL › View
I became quite nervous when I knew that my speech ______
A. was to record
B. was being recorded
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I ____ finish an essay tonight.
A. have got
B. mustn’t
C. need to
