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
网友回答
(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、