单项选择题

The Yellow River is the second ______river in China.

A．long
B．longer
C．longest
D．most long
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单项选择题
Mary wishes that she ______law instead of history when she was in college.
A．had studied
B．studies
C．has studied
D．studied
单项选择题
______we will do next is still under discussion.
A．Thai
B．When
C．Where
D．What
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