I did not know how long the poor old man _______ there and decided to after him a sandwich.
A. sat
B. had sat
C. was sitting
D. had been sitting

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Put some sugar in ___ coffee.
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Differentiate between the tenses: “I will eat dinner” and “I will be eating dinner.”
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C. The first is future simple, the second is future continuous.
D. Both are future continuous tense.
