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

It was your brother () I met at the station.

A. who
B. whom
C. that
D. why

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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