单项选择题

She tried hard, （）she was unsuccessful.

A. therefore
B. but
C. or
D. unless

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单项选择题
They stand（）

A. under the sun
B. in the sun
C. over the sun
D. against the sun
单项选择题
She had changed so much that I could hardly（）her.

A. differ
B. find out
C. explain
D. recognize
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