--- Is there anything wrong , Tom ? You look upset . ---Oh, nothing . In fact , I ______  the coming National College Entrance Examination
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A
have just thought of
B
was just thinking of
C
will just be thinking of
D
would just think of
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---How can you keep slim as a mother of two sons?---I _______ in the gym for years.
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A
have worked out
B
have been working out
C
have worked on
D
have been working on
Do you still remember the key points that ___________ in his report? I don’t remember them all. 
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A
referred to
B
were referred
C
he was referred to
D
were referred to