单项选择题

He was awakened by ______ knocking on the window.

A．someone"s
B．someone
C．mine
D．him
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单项选择题
It s said that Dr. Anderson was breaking fresh ______ in cancer research.
A．floor
B．land
C．earth
D．ground
单项选择题
In spite of all the opposition, his family was ______ of his attempt to become a singer.
A．appreciative
B．supportive
C．considering
D．indicative
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