[ Irregular Verb ]
Nanita has ______ how to convert from active to passive since before she could walk.
A. known
B. knew
C. knowen
D. knowed
Select your answer:
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Vocabulary › ViewA root that means: around
A. tele
B. peri
C. port
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Choose the correct verb form: 20 percent of the work (has/have) been done.
A. has
B. have
C. had
D. having