Asked by jessica

the bus would not have had to take the
A
long detour instead of the main
B
highway if the bridge did not become
C
treacherous in the aftermath of an ice
D
storm.

why is C wrong?

thanks so much !
Answered by jessica
C. did not become
Answered by bobpursley
would not had to take if the bridge <u>had</u> not become

verb tense
Answered by Writeacher
You can read and study verb tenses, specifically the <b>sequence of tenses</b> here:

http://grammar.ccc.commnet.edu/grammar/verbs.htm#sequence
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