The wet weather will continue tomorrow when a cold front ___ to arrive.

问题描述:

The wet weather will continue tomorrow when a cold front ___ to arrive.
is expecting
is expected
expects
will be expected
我选的是第二个,但是不确定

我也同意,此句子为主从复合句,when引导的时间状语从句在主句是将来时态时,从句为一般现在时.而且expect应为被动语态.