it is usually quite warm in September,__ it often rains,__ bring a waterproofa) but,sob) so,becausec) unless,butd) for,as为什么

it is usually quite warm in September,__ it often rains,__ bring a waterproofa) but,sob) so,becausec) unless,butd) for,as为什么
it is usually quite warm in September,__ it often rains,__ bring a waterproof
a) but,so
b) so,because
c) unless,but
d) for,as
为什么

it is usually quite warm in September,__ it often rains,__ bring a waterproofa) but,sob) so,becausec) unless,butd) for,as为什么
A

A