单项选择题

（）the lights in Tom's room were out, Mary thought he was not at home.

A、 Seeing
B、 Saw
C、 Having seen
D、 Have seen

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单项选择题
Perhaps this is the only way（）you can learn a foreign language well.

A、 that
B、 where
C、 which
D、 how
单项选择题
So little（）about the topic that I had nothing to talk about.

A、 will I knew
B、 did I know
C、 do I know
D、 have I known
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