I found hard to get out of bed on cold winter mornings.A. thatB. thisC. it isD. it

问题补充：

I found hard to get out of bed on cold winter mornings.

A. that

B. this

C. it is

D. it

答案：

A. that

B. this

C. it is

(答案→)D. it

解析：句意：我发现在寒冷的冬天的早晨起床很难。sb find+it+形容词+to do sth某人发现做某事很....(it为形式宾语,to do sth为真正的宾语,形容词作宾语补足语)，在习惯上这句不用加is。故选D.