[ Vocabulary ]
Scientists think that wild animals must ____________ in their natural habitats.
A. keep
B. to keep
C. be keeping
D. be kept
Select your answer:
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Other quiz:
Grammar › ViewWhen I got to the meeting, it _____ already started.
A. had
B. has
Modal Verbs & Reflexive Pronouns › View
He … be on time for the exam.
A. can
B. must
C. musts
D. have to
How to use : Read the question carefully, then select one of the answers button.