单项选择题

The smog is due ______ invisible gases, mostly from automobile exhaust.

A．from
B．to
C．for
D．with
<上一题 目录 下一题>
热门 试题

单项选择题
My mother always gets a bit ______ if we don't arrive when we say we will.
A．anxious
B．ashamed
C．weak
D．patient
单项选择题
Danby left words with my secretary ______ he would call again in the afternoon.
A．who
B．that
C．as
D．which
相关试题