单项选择题

What's ____ issue here is the difference between cosmetic and plastic surgery.
A、at
B、on
C、in

A.A、at
B、on
C、in
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单项选择题
They built a robot capable of ___________ spoken commands.A、understandB、understandingC、understood
A.A、understand
B、understanding
C、understood
单项选择题
We trust this new product of ours will ____________ to your market.A、appealB、appearC、appease
A.A、appeal
B、appear
C、appease
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