The train was delayed (. ) the heavy rain.
(A) by
(B) due to
(C) because of
I wouldn't use by. I would use one if these: The train was delayed due to / because of / owing to / on account of the heavy rain. CB
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I wouldn't use by. I would use one if these:
The train was delayed due to / because of / owing to / on account of the heavy rain.
CB