[ Tenses ]
They ____ for a few minutes before the rest of the group arrived.
A. Are talking
B. Have been talking
C. Had been talking
D. Had waited

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Tenses › View. She was very upset because she _______ the opportunity to visit the museum when it was still open.
A. missed
B. had been missing
C. had missed
D. was missing
Grammar › View
My mother-in-law is _____ at our house this week.
A. stay
B. staying
C. be staying