单项选择题

______ he was seriously ill, I wouldn't have told him the truth.

A．If I knew
B．If I know
C．Had I known
D．Did I know
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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
单项选择题
We agree to accept ______ they thought was the best tourist guide.
A．whatever
B．whomever
C．whichever
D．whoever
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