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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They visited the internationally famous mountain, ______ their stay in Africa.
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B．during
C．within
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As a foreign student in China, she can’t make herself ______ in Chinese.
A．understand
B．understood
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