单项选择题

Neither the students nor the professor himself（）the way out.

A．has found
B．have found
C．found
D．finds

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单项选择题
When I put my ear on his chest, I could hear his heart still（）.

A．beating
B．to beat
C．to be beating
D．was beating
单项选择题
Every possible means（）tried, but we can not open the door.

A．are
B．are being
C．were
D．has been
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