单项选择题

Mr. Hall understands that _____ math has been easy for him, it is not easy for the students.

A．although
B．because
C．if
D．when
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Their happy voices showed that they were having a _____ talk.
A．noisy
B．serious
C．complete
D．friendly
单项选择题
Was it because it snowed last night _____ you didn't come
A．when
B．that
C．so
D．what
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