[ Vocabulary ]
a substance used to keep people from getting a disease
A. protect
B. symptom
C. vaccine
D. virus
Select your answer:
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Verb Types and Tenses › ViewIn the sentence ‘Dr. Chandra had explained his theory to the class last week,’ which tense is ‘had explained’?
A. Past Perfect
B. Present Perfect
C. Future Perfect
D. Past Progressive
Regular and Irregular Verbs › View
The students________(walk) to school every day.
A. walkd
B. walked
C. playyed
D. played