[ Grammar ]
A ____ links a noun or a pronoun to the rest of the sentence.
A. preposition
B. noun
C. verb
D. adjective
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Grammar › View. The Himalayan mountains are believed _______ about 50 million years ago.
A. to have been formed
B. that were formed
C. forming
D. to form
Prepositions › View
Robots at home will help people __________ household chores.
A. at
B. with
C. for
Tenses › ViewShe _____ yawns (ngáp) in English class.
A. sometimes
B. already
C. sometime
D. though
Verb to have › View
He ………. a nice hair.
A. have
B. am
C. is
D. has