单项选择题

Not until quite recently ______he gave up his plan to go abroad.

A．I knew
B．I had known
C．did I know
D．I did know
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单项选择题
I recognized John ______he entered the room,
A．hardly
B．the minute
C．no sooner
D．at once
单项选择题
Let’s have a ______discussion about this topic.
A．farther
B．further
C．father
D．far
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