单项选择题

Physics is the present-day equivalent of （） used to be called natural philosophy, from which most of present-day science arose.

A. that
B. all
C. which
D. what

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That’s a nice watch. I wish I （） one like it.

A. have
B. had
C. have had
D. can have
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A new technique （）, the yields as a whole increased by 20 percent.

A. working out
B. having worked out
C. having been worked out
D. to have been worked out
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