单项选择题

You won’t know if you like it （）you try it

A. once
B. for
C. since
D. unless

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（）I felt bad, I couldn’t control my temper

A. If
B. Because
C. while
D. Even

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（）Michael is on vacation now, he may do some work from home

A. When
B. If
C. Once
D. Even though

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