单项选择题

（）problems you have, ask Harry here to help you. He knows everything.

A. However
B. Whatever
C. Whenever
D. Wherever

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Francis Preston Blair Jr. , （） born in Kentucky, lived and practiced law in Missouri.

A. was
B. although
C. he was
D. who he was
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By the time you arrive, I （） working for two hours.

A. will be
B. can
C. will have been
D. have been
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