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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单项选择题
Never before have I heard the song ______ in English.
A．sung
B．singing
C．to be sung
D．singing
单项选择题
I was quite at a loss ______ next.
A．what's to do
B．what to do
C．what to be done
D．how to do
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