单项选择题

When asked by the police, he said that he remembered ______ at the party, but not

A．to arrive; leaving
B．to arrive; to leave
C．arriving; leaving
D．arriving; to leave
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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
单项选择题
The smog is due ______ invisible gases, mostly from automobile exhaust.
A．from
B．to
C．for
D．with
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