单项选择题

（）is known to the world, Mark Twain is a great American writer.

A、 That
B、 It
C、 Which
D、 As

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单项选择题
Only after I mailed the letter（）that I had forgot to put a stamp on it.

A、 I remembered
B、 did I remember
C、 I didn't remember
D、 didn't I remember
单项选择题
John told us that by the end of the year he and his wife（）together for thirty years.

A、 would have been living
B、 would have lived
C、 would have been lived
D、 will have been living
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