问题
She looks very sad. I want to help her, but I just don’t know ____ to do it.
A:what
B:when
C:how
D:which
B:when
C:how
D:which
正确答案是：
同类题型
The young girl stood there ______ without saying anything.
supper, he washes his hands. [ ]
Listen ! Helen is singing in the next room.—It _______ be Helen. She has gone to Beijing.
Is this ________ dictionary? —No, _____ isn’t _______ dictionary.
Which of the two T-shirts will you take?—I’ll take ___, one for my father, the other for myself.