请指出该中文句子中的主语"学英语能够预防老年痴呆"
A. 学英语
B. 英语
C. 老年痴呆
D. 能够
请指出该英文句子中的主语 In the morning,Lily visited me?(早晨丽丽来看了我)
A. morning
B. Lily
C. visited
D. me
请指出该句子中的主语"That he Ioves me is true."(他爱我这件事是真的)
A. me
B. That
C. he
D. That he Ioves me
下列选项中哪一句话中的动词sing(唱歌)可以作为主句的谓语?
A. I know a man who sings well.
B. Singing well, the man receives wide acclaim.
C. He is singing.He is singing.
D. Singing is so hard.