31．—So you know Della? —Yes it was last weekI surfed the Internet.A. that B. whenC. whyD.

问题补充：

31．—So you know Della?

—Yes, it was last weekI surfed the Internet.

A. that

B. when

C. why

D. Whom

答案：

A. that

(答案→)B. when

C. why

D. Whom

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