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The doctor prescribed the patient some drugs, which are effective against a range ___ bacteria.

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填空(必要时改变形式)fulfillobstacleperspective profoundincredibleceasevisiondefine

I’ll go swimming with you if I ________ free tomorrow.

A. will be
B. shall be
C. am
D. was

You should finish your lessons _______ you go out to play.

A. before
B. after
C. when
D. while

_______ I felt very tired, I tried to finish the work.

Although
Because
C. As
D. As if

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