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
We agree to accept（）they thought was the best tourist guide.

A．whatever
B．whomever
C．whichever
D．whoever
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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