单项选择题

I was quite at a loss ______ next.

A．what's to do
B．what to do
C．what to be done
D．how to do
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单项选择题
At the moment the machine ______ at full speed.
A．ran
B．was running
C．had been running
D．had run
单项选择题
-- Why haven' t you asked her to come here -- She ______ an important experiment when I found her and she ______ it.
A．had done, didn' t finish
B．was doing, hash' t finished
C．did, wouldn' t finish
D．would do, hasn' t finished
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