问题

mily is a cooperative enterprise forwhich it is difficult to _____ rules, because each family needs to work out itsown ways to deal with its own problems
A:her long hair flowed in the breeze
B:her long hair was flowing in the breeze
C:her long hair flow in the breeze
D: her long hair flowing in the breeze
B:her long hair was flowing in the breeze
C:her long hair flow in the breeze
D: her long hair flowing in the breeze
正确答案是: