单项选择题

When we left, he again expressed his ______ of our timely help.

A．gratefulness
B．appreciation
C．expectation
D．anticipation
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单项选择题
______ at from outer space, the Earth is just like a ball hanging in the universe.
A．Having looked
B．Looking
C．Looked
D．Having been looked
单项选择题
We intended to ______ you to make a speech on environmental protection in our university, but we couldn't find enough time to prepare for it.
A．invite
B．be invited
C．have invited
D．have been invited
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