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
Yao Ming, who ______ the Houston Rockets, is working hard to make his dream come true.
#103317
A
joined
B
joined in
C
took part in
D
competed in
Since then I a member of the family and never from them.
#105007
A
have be come; will I separate
B
have be come; I will separate
C
have been; will be separated
D
have been; I was separated
This machine __________ It has worked for years.
#102524
A
didn’t work
B
wasn’t working
C
doesn’t work
D
isn’t working
--- Each of the students, working hard at their lessons, ______ the book. --- So have I.
#104090
A
is reading
B
has read
C
reading
D
reads
John promised his doctor he ________not smoke，and he has never smoked ever since.
#101399
A
might
B
should
C
could
D
would