单项选择题

"I bought this computer for $500 last week."
"It's on sale this week for only $400. You should have waited."
"Oh, really But how ______ I know"

A．can
B．will
C．do
D．would
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单项选择题
All the people in the office laugh at his ______ habit of feeding himself on the left over for lunch.
A．economic
B．disgusted
C．miserly
D．miserable
单项选择题
If you want to lose weight, you should not take such food ______ really necessary.
A．as is
B．as it is
C．as it was
D．as was
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