The trouble with such resources as coal, oil and gas ______ that they are not renewable.
#99825
A
was
B
are
C
have been
D
is
推荐题目
No one _______ the building without the permission of the policeman.
#100920
A
is leaving
B
will be leaving
C
has left
D
is to leave
He can________$ 3,000 a year by writing stories to support a family of three people.
#101097
A
spare
B
afford
C
earn
D
charge
---Oh, it’s you! I ______ you.--- I’ve just had my hair cut.
#100348
A
don’t recognize
B
didn’t recognize
C
haven’t recognized
D
hadn’t recognized
