when the old man had a heart attack,his son rang up the .....中rang的时态是否正确？

when the old man had a heart attack,his son rang up the .....中rang的时态是否正确？

个人感觉rang 应该改成ringing。
或者，此句也可以写成 His son ringing up the .....when the old man had a heart attack.
翻译：当他儿子电话正响起时，老人犯心脏病了。
这样看起来会更直接。

when后面跟过去时态had是对的。追问：1.we ___ just need some time to think ,and___ we can find out.....
A.maybe, maybe B.may be, maybe C MAY ,MAYBE 他们的区别是？2.---where ____ the key to the door?---i ___ it right on the table.But now it's gone.第一空.have you put ;did you put ;have you put第二空.put;have put;had put 区别是？3.I used to do...与I didn't use to do.... 关系是?

是正确的 ，要用过去时态追问why?追答后面的句子你能补充完整，吗？追问4.I ____ the road when a car ___ around the corner .A.was crossing ,was coming B.was crossing,came C.crossed ,was coming D.crossed,came
5.I have a___ work ___ he. A.as much ;as B more ;as c.many more ;as

right 前面用了had 明显是过去时嘛追问追问It's necessary to ban some products ___ TV commercial.
中in 行吗？