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
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单项选择题
Our English teacher insisted that we spend more time on______ reading.
A．worth
B．worthy
C．worthwhile
D．worthless
单项选择题
Sales have shown some improvement ______ we launched the new product last year.
A．until
B．unless
C．since
D．although
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