Question

It was()it rained heavily that they didn't come. A.as B.becauseC.forDsince 为什么不选C 谢谢

Answer 1

even
though
和though都能表示即使的意思，但是even
though前面不能用逗号，例some
machines
are
called
robots
even
though
they
cannot
move
around.
有些机器也被称为机器人，尽管他们不能移动。但though前面能加逗号，例
in
the
second
period,
though,
the
effect
was
reversed.
在第二个时期，竞争却起相反的作用。所以选b

Answer 2

for后面加名词结构，不能加一个句子，而because后面可以加句子。
如果是以下这样也对。It
was
for
the
rain
that
they
didn't
come.