单项选择题

A new technique ______, the yields as a whole increase by 20 percent.

A．working out
B．having been worked out
C．having worked out
D．to have been worked out
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单项选择题
We agree to accept ______ they thought was the best tourist guide.
A．whatever
B．whomever
C．whichever
D．whoever
单项选择题
He will soon get ______ his disappointment and be quite cheerful again by the morning.
A．over
B．out of
C．away
D．through
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