单项选择题

You___have come to the concert. It was excellent.
A. may
B. need
C. ought to
D. must

A.
A.

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A.金黄色葡萄球菌
B.乙型溶血性链球菌
C.猪丹毒杆菌结核杆菌
D.麻风分枝杆菌以下疾病分别由哪种病菌感染引起

A.金黄色葡萄球菌
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单项选择题

To make our neighborhood more beautiful, we needn‘t do much more than make a little___in our daily life.
A. option
B. goodness
C. thing
D. change