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
James has just arrived, but I didn't know he（）until yesterday.

A. will come
B. was coming
C. had been coming
D. came
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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