单项选择题

When it was clear ______ she did not speak a word of English, I tried to talk to her using the Spanish I learned while living in Europe.

A．what
B．that
C．why
D．how
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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
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
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