____ Jenny always take the bus?A. Do B._爱下问搜题

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问题选择题

____ Jenny always take the bus?

A. Do
B. Does
C. Did

答案

答案：B

选择题

He is badly (严重地) ill, but he never stops _______. [ ]

A. to work

B. working

C. work

单项选择题

无密码子的氨基酸是

A．鸟氨酸

B．精氨酸

C．异亮氨酸

D．羟脯氨酸