[ Tenses ]
While the wife …………., the husband slept.
A. did work
B. has worked
C. is working
D. was working

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Grammar › ViewI wish I … why Natalie is so upset with me.
A. knew
B. had known
C. could know
Perfect and Past Tense › View
The pack of dogs… left the area since few days ago.
A. have
B. was
C. has
D. were