单项选择题


A．Because
B．As
C．Due to
D．For
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单项选择题
A．usuallyB．frequentlyC．obviouslyD．naturally
A．usually
B．frequently
C．obviously
D．naturally
单项选择题
Sam did nothing else than ______ when he saw the old lady fell down on the ground.
A．stand by
B．standing by
C．stood by
D．stood up
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