单项选择题

（）you start to feel worse than before, you will need to go to the hospital

A. As
B. Had
C. Should
D. Would

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单项选择题

We send in a report every day, （）the manager knows what we're doing

A. so
B. and
C. but
D. or

单项选择题

Sam bought a new cell phone （）he already had one

A. and
B. even though
C. if
D. when

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