[ Present Verb Tenses ]
We ______ (wait) for the bus for 20 minutes, and it still hasn’t arrived.
A. wait
B. have waited
C. have been waiting
D. are waiting

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Articles › ViewHe invited her to have __ dinner with him.
A. a
B. the
C. one
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Modal › View
Which sentence uses the modal verb to express obligation?
A. You have to finish your homework.
B. I should go to the party.
C. She will play the piano.
D. They could go to the party.
