[ Perfect Tenses ]
What time words or signals are used with the present perfect tense?
A. now, today
B. for, since, yet
C. yesterday, last month
D. tomorrow, next week

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Articles › ViewI have to buy ____umbrella.
A. a
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Compound and Complex Sentences › View
Which of these is not a coordinating conjunction?
A. yet
B. after
C. so
D. and
