单项选择题

A．although
B．because
C．unless
D．once
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单项选择题
When did Bill begin working for the paper
A．In 1948.
B．In 1926.
C．In 1937.
D．In 1929.
单项选择题
What is the main topic of the conversation
A．How to select a good umbrella.
B．How to treat minor aches and pains.
C．How to sharpen the senses.
D．How to predict the weather.
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