单项选择题

The teacher asked a very difficult question, but finally Ted______ a satisfactory answer.

A．came with
B．came up
C．came up with
D．came up for
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单项选择题
The barrier of language keeps many scientists in prolonged ignorance of work of immediate importance to them ______at present in many countries.
A．doing
B．to be done
C．having done
D．being done
单项选择题
When preparing elementary school test, care should be taken______.
A．not to make the vocabulary more difficult than necessary
B．not to make the vocabulary that difficult
C．so as to not make the vocabulary part too hard
D．in not making the vocabulary a problem in terms of it difficulty
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