单项选择题

-- Why haven' t you asked her to come here
-- She ______ an important experiment when I found her and she ______ it.

A．had done, didn' t finish
B．was doing, hash' t finished
C．did, wouldn' t finish
D．would do, hasn' t finished
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单项选择题
I ______ a taxi when it was raining.
A．used to take
B．used to taking
C．used to be taking
D．was used to taking
单项选择题
Mr. Green, together with his colleagues ______ a party in the next room.
A．are enjoying
B．is enjoying
C．have enjoyed
D．has enjoyed
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