单项选择题

The problem was so tough that the pupils did not know how to __________ it.

A．abolish
B．encounter
C．remove
D．tackle
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单项选择题
According to the result of the research, smokers will know which brands are most __________ to affect their health.
A．certainly
B．definitely
C．likely
D．naturally
单项选择题
__________ I came to China __________ I knew what kind of country she is.
A．It is not until; when
B．It is until; that
C．It was not until; when
D．It was not until; that
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