单项选择题

The book took ten years of thorough research.()

A. basic
B. social
C. major
D. careful

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单项选择题
She could not answer, it was an immense load off her heart.()

A. natural
B. fatal
C. tiny
D. enormous
单项选择题
Argument among the speakers at the conference is bordering on violence.()

A. is close to
B. is beside
C. is next to
D. is alongside
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