[ Continuous Tenses ]
He ….. lunch when the guests arrived.
A. is having
B. having
C. was having
D. would have

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Modal Auxiliaries › ViewTom is sitting at his desk. He’s reading his chemistry text because he has a test tomorrow. He _______
A. could study
B. should be studying
C. will studying
D. must be studying
Grammar › View
Please close _______ door before you go out.
A. a
B. an
C. the