问题

The trouble with resources as coal, oil and gas _____ that they are not renewable.[ ]

A: has been
B: is
C: have been
D: are

正确答案是：

同类题型

There is _______ salt in the bottle.

. –My pet dog died yesterday.— ________.

Will ______be _______to pick me up at 8:00am at the airport on Sunday? —–No problem You can call me at any time

I decided ________ at least once a week.

Eating ________ is bad for your health.