Question

It was raining hard, ________ they couldn't go out for walk.

A. because B. or C. but D. so

Answer 1

答案D
【解析】并列连词so构成的并列句可以转换成由从属连词because构成的主从复合句。此句相当于：Because
it
was
raining,
they
couldn't
go
out
for
a
walk.
另外，so和because不可同时出现在句中。