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【单选题】

.There is such an occasion ___________ we know lots of words, but we can’t choose a suitable one to express ourselves.

A.
where
B.
when
C.
which
D.
what
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参考解析:
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举一反三

【单选题】The girl looked at me with a ________expression at the ______ computer program.

A.
puzzled , puzzling
B.
puzzling, puzzled
C.
puzzling , puzzling.
D.
puzzled , puzzled