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(A) The temperature in big cities don’t drop even at night.

(B) The temperatures in big cities don’t drop even at night.

(C) Temperatures don’t go down even at night in big cities.

(D) The temperatures don’t go down even at night in big cities.

I want to know whether “the” is necessary or not, and whether I should use “s.”

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Here's the one you need:

Temperatures in big cities don't go down even at night.

CJ