单项选择题

I doubt ______.

A. whether he can come
B. if he can come or not
C. while he will be here
D. that he will come
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A．businessB．aidC．serviceD．duty
A．business
B．aid
C．service
D．duty
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A．dependableB．dependentC．reliableD．relying
A．dependable
B．dependent
C．reliable
D．relying
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