单项选择题

How did Ruby paint at the very beginning（）

A．She used a stick to draw in the dirt.
B．She spent much time in the dirt.
C．She stimulated herself every day.
D．She painted with her keeper's art supplies.

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单项选择题

Millions of Americans flock to their drugstore to buy vitamins and minerals, （）that these pills can help to prevent serious illnesses.

A．convincing
B．convinced
C．to convince
D．to be convinced

单项选择题

If they had sent a check to the telephone company last week, their telephone （）out of service at this moment.

A．will not be
B．will not have been
C．would not be
D．would not have been