it is spent ____填doing 还是to do.
问题描述：
it is spent ____填doing 还是to do.
答
spend ...(in) doing ...
如 I spent two hours (in) watching TV.这是被动呢，某些被动要改to do .我不会分清动词后接 to do 还是 doing 与主动被动无关，刚才我举的那个例子，变成被动以后，还是用doingTwo hours was spent watching TV by me.英语中没有一个动词在变成被动语态后doing 改成 to do 的，一定是你理解错了。倒是有使役动词, 感官动词变成被动语态后把省略的to 加上一说。如 The boy was seen 【to run】 outside.若还不懂，欢迎继续追问。