My son his clock when I went to get a cup I in his study.A. was winding up; had leftB. w

问题补充：

My son his clock when I went to get a cup I in his study.

A. was winding up; had left

B. would up; had forgotten

C. had wounded; left

D. was winding up; forgot

答案：

(答案→)A. was winding up; had left

B. would up; had forgotten

C. had wounded; left

D. was winding up; forgot

解析：考查时态。句意：当我去拿我留在他的书房的茶杯时，我的儿子正在给他的钟表上发条。结合语境可知主句描述的是正在进行的动作，下文从句描述的是过去某时已经完成的动作，故选A、