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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单项选择题
Did you ever go there I ______ go there by myself.
A．used
B．used to
C．am used to
D．was used to
单项选择题
Never before have I heard the song ______ in English.
A．sung
B．singing
C．to be sung
D．singing
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