单项选择题

Mrs. smith, （） is a retired teacher, does volunteer work at the hospital.

A．she
B．who
C．as
D．that

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单项选择题
His dislike of the course may prove to be a(n) （） barrier he cannot overcome.

A．biological
B．ideological
C．spiritual
D．psychological
单项选择题
Without their help, she （） in passing the entrance exam.

A．doesn't succeed
B．didn't succeed
C．couldn't succeed
D．couldn't have succeeded
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