单项选择题

Water pollution, together with old tins and other forms of garbage, （） many problems in our large, industrial city today.

A．is causing
B．have caused
C．have been causing
D．are caused

<上一题 目录 下一题>
热门 试题

单项选择题
（）scientist and （） pianist （） been invited to the New Year' s Eve reception given by the government.

A．The... the... have
B．The... ×... have
C．The... ×... has
D．×... the... has
单项选择题
When we reached the pier, the ferry had not arrived yet; so we （）.

A．needed not to hurry
B．needn' t have hurried
C．didn't need to hurry
D．had not needed to hurry
相关试题