单项选择题

The class ______ in the hall, listening to a lecture.

A．was
B．were
C．been
D．have
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单项选择题
It was in the small house ______ was built with stones by his father ______ he spent his childhood.
A．which ... that
B．that ... which
C．which ... which
D．that ... where
单项选择题
If only we ______ then, the disease was curable.
A．knew
B．could know
C．had known
D．would have known
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