单项选择题

He is said ___________ much progress in his studies since last year.

A．to make
B．to have made
C．to be making
D．making
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单项选择题
To be successful, a business needs to be aware of its ___________ and weakness as com- pared with its opponents.
A．virtue
B．merit
C．strength
D．advantage
单项选择题
___________ liberated in 1949, the workers and peasants ___________ a hard life now.
A．Had not China been, would still be living
B．Had not China been, would have still been living
C．Had China not been, would still be living
D．Had China not been, were living
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