[ Grammar ]
I saw _____ president on TV tonight.
(President: tổng thống)
A. 0
B. a
C. an
D. the

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Grammar › ViewAdverbs answer the questions:
A. when? where? how? why?
B. which? when? whose? to what degree?
C. when? where? how? to what degree?
D. what? whom?
Perfect Tenses › View
Which auxiliary verbs are used to form the present perfect tense?
A. will, shall
B. is, are
C. has, have
D. was, were