“（）”是鲁迅主张的对外来文化所采取的态度。
参考答案：拿来主义
He was so busy ____ his homework that he forgot to have supper.
A．to do
B．do
C．doing
D．does
交叉渡线为什么要换位？什么情况下交叉渡线不换位？
