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
_________the desert is like a sea,_________ is the camel like a ship.
A．What, as
B．As, so
C．As, as
D．That, so
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
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