单项选择题

When Mark opened the door, he saw a woman standing there. He ______ her before.

A．never saw
B．had never seen
C．never sees
D．has never seen
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单项选择题
The smog is due ______ invisible gases, mostly from automobile exhaust.
A．from
B．to
C．for
D．with
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
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