----How did this accident happen?----You know ,it ___ diffic

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----How did this accident happen?----You know ,it ___ difficult to learn when it ____ rainy.
A.is is
B.was was

---How did this accident happen?----You know ,it ___ difficult to learn when it ____ rainy.
选B
因为前面是过去时,所以前后时态要一致,用过去时
再问：下雨天行车困难算不算客观真理？
再答：不算只有类似太阳从东边升起地球绕太阳转这种才叫客观真理的

----How did this accident happen?----You know ,it ___ diffic Did you know how the accident _______(happen) that afternoon --How did the accident happen? how did you get to know all about the accident Did you see the accident happen how much did you ___ this book How did the accident happen?改同义句 How did you get to know all about the accident?-----_____. when did the accident happen Do you know?Where did it happen?(合并成宾语从句） What happened to you与how did it happen?的用法 Did you see the traffic accident yesterday?Yes ,I saw it ___