单项选择题

He was very busy yesterday; otherwise he ______ to the meeting.

A．would have come
B．would come
C．could come
D．had come
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单项选择题
Sorry I can't answer your question. I know ______ about the subject.
A．a little
B．some
C．little
D．few
单项选择题
______ from space, our earth, with water covering 70% of its surface, appears as a blue planet .
A．Seen
B．Seeing
C．To be seen
D．Having seen
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