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

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

B、过去式

第一个是is第二个是was

A