[ Grammar ]
I had to wait 45 minutes for a bus yesterday. There ___ an accident or maybe a strike.
A. might have been
B. might be
C. must have been
Select your answer:
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Meat ___ in a refrigerator or it will spoil.
A. must be kept
B. must keep
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There were many people ___ to help us.
a. by hand
b. on hand
c. in hand