单项选择题

______ nearly all behavior is learned behavior is a basic assumption (假设) of social scientists.

A．/
B．That
C．It is acceptable
D．When
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单项选择题
Mr. Hal! understands that ______ maths has always been easy for him, it is not easy for the students.
A．unless
B．since
C．although
D．when
单项选择题
______ the term is finished, I'm going to rest a few days and then take a trip.
A．Now that
B．Even if
C．As if
D．So that
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