______ is where to go for a picnic.A.What they worryB.What worries themC.What is worriedD.What they are worried帮忙解释一下
问题描述：
______ is where to go for a picnic.
A.What they worry
B.What worries them
C.What is worried
D.What they are worried
帮忙解释一下
答
D
答
B
使他们烦恼的事是:去哪里野餐.
答
也许…是D
答
B
答
B.困扰他们的是去哪儿野餐.What worries them作主语；where to go for a picnic作表语；