单项选择题

______ about the universe up till now.

A. So little had me known
B. Only a little do we know
C. Very little have we known
D. Little shall we know
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单项选择题
She’ll never forget her stay there ______ she found her son who had gone missing two years before.
A. that
B. which
C. where
D. when
单项选择题
The following day I ran nay first race at high ______.
A. latitude
B. altitude
C. longitude
D. attitude
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