[ Grammar ]
Tim ______ the violin when the doorbell rang.
A. were playing
B. was playing
C. playing

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General Knowledge › ViewProtein that fills the cells of your hair is called keratin
A. True
B. False
Grammar › View
I live _____ an apartment _____ two American boys
A. in/of
B. at/with
C. in/with
D. of/with