题目内容

The boy finally chose to major ___ philosophy at Harvard.

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

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