问题

untry’s chief exports are coal, cars and cotton goods, cars_____ the most important of these.

A:have been
B:are
C:being
D:are being;

正确答案是：

同类题型

______is the Changjiang river in China, do you know—Yes, it’s about 6,380 kilometers long.

Measures must be ______ to keep the factories _____ going on polluting the rivers[ ]

The technological advances of the twentiethcentury have been brought about analarming reduction of our natural resources.

________the way, where does your sister work

I saw two movies last week, but _______ of them was good.