单项选择题

______ seems easy in theory seems difficult in practice.

A．That
B．With
C．It
D．What
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单项选择题
The students didn t manage to work out the problem ______ their teacher had explained how.
A．when
B．until
C．unless
D．as
单项选择题
—Could I borrow your dictionary—I d get it for you ______ I could remember who last borrowed it.
A．except that
B．if only
C．only if
D．unless
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