--- Did you go to London for vacation? --- I to go but I got sick at the last minutes.A.

问题补充：

--- Did you go to London for vacation?

--- I to go, but I got sick at the last minutes.

A. was planning

B. have planned

C. had been planning

D. have been planning

答案：

A. was planning

B. have planned

(答案→)C. had been planning

D. have been planning

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