单项选择题

He told me about how she succeeded in ______ the new product.

A．develop
B．to develop
C．developed
D．developing
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单项选择题
I find it difficult to believe what he says______he never tells me the truth.
A．so
B．as
C．though
D．while
单项选择题
Our English teacher insisted that we spend more time on______ reading.
A．worth
B．worthy
C．worthwhile
D．worthless
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