单项选择题

We knew (so little) about (equipments), (disposal) techniques, the (whole) thing.

A．so little
B．equipments
C．disposal
D．whole
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单项选择题
I feel very sad that the young man's energetic initiative ______ with nothing in the experiment, for he met a lot of interference from the powerful authority.
A．burned up
B．tuned up
C．pushed up
D．ended up
单项选择题
There is a loss of self-confidence, a sense of personal failure, great anger and a feeling of being utterly ______.
A．let alone
B．let out
C．let down
D．let on
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