单项选择题

The committee ______ the problem for a whole afternoon but they have not yet reached an agreement.

A．has discussed
B．has been discussing
C．are discussing
D．have been discussing
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单项选择题
You can take anything from the shelf and read, but please ______ the books when you've finished with them.
A．put on
B．put down
C．put back
D．put off
单项选择题
Other medical technology groups are working on ______ telemedicine to rural care,
A．applying
B．supplying
C．replying
D．implying
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