单项选择题

A．at length
B．to a great extent
C．from their heart
D．by all means
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单项选择题
A．at a lossB．at lastC．in factD．on the occasion
A．at a loss
B．at last
C．in fact
D．on the occasion
单项选择题
A．SinceB．AlthoughC．HoweverD．Before
A．Since
B．Although
C．However
D．Before
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