单项选择题

I'm reading a newspaper ______ Mr Zhang is writing a letter.

A. so
B. while
C. when
D. or
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单项选择题
What we have seen is ______.
A. from what we heard
B. all what we heard
C. to what we have heard
D. from what we have heard
单项选择题
______ you may do, you must do it well.
A. Which
B. Whenever
C. Whatever
D. When
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