单项选择题

With his poor English, he even cannot get his ideas across, ______ exert any essential effect on others.

A．let alone
B．that's to say
C．not to speak
D．not to say
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单项选择题
The invention of electricity made great contribution to civilization ______ which subsequently there are few findings comparable until now.
A．to
B．in
C．for
D．from
单项选择题
Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.
A．inclined to
B．subjected to
C．prone to
D．bound to
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