单项选择题

He ______ a good knowledge of English by careful study.

A．gained
B．obtained
C．earned
D．acquired
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单项选择题
______ luck would have it, we arrived in time to catch the 8:00 o'clock flight to Madrid.
A．Which
B．As
C．Before
D．Because
单项选择题
There were still some minor grammar mistakes, but ______ the composition was rather well-written.
A．in the way
B．all in all
C．on the whole
D．as a whole
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