单项选择题

We thought there were 35 students in the dining hall, ______, in fact, there were 40.

A．while
B．whether
C．what
D．which
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单项选择题
______ in time, the pills will be effective.
A．Taken
B．Taking
C．Take
D．To take
单项选择题
He found it increasingly difficult to read, ______ his eyesight was beginning to fail.
A．and
B．for
C．but
D．or
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