单项选择题

Not until yesterday__________ anything about the project that will be completed soon.

A．did I learn
B．have I learnt
C．I learnt
D．that I learnt
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单项选择题
It's my great honor__________ to give a speech at the opening ceremony.
A．to invite
B．inviting
C．having invited
D．to be invited
单项选择题
I was almost asleep last night when I suddenly heard someone__________ at the door.
A．be knocking
B．knocking
C．to knock
D．having knocked
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