单项选择题

The secretary worked late into the night, ______a long speech for the president.

A．to prepare
B．preparing
C．prepared
D．was preparing
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单项选择题
Can you ______ the difference between these two types
A．answer
B．say
C．talk
D．tell
单项选择题
Bob said he would do what he could ______ you with your study.
A．help
B．to help
C．helping
D．helped
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