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
------You speak very good French!--------Thanks .I _____ French in Sichuan University for four years.
#99781
A
studied
B
study
C
was studying
D
had studied
This is the first time that I _____ the summer palace．
#104123
A
had visited
B
have visited
C
visit
D
visited
---Is everyone here? ---Not yet. Look, there_______ the rest of our students!
#103245
A
come
B
comes
C
is coming
D
are coming
-How long ______ each other before they ______ married?--For about a year.
#104894
A
have they known; get
B
have they known; were going to get
C
do they know; are going to get
D
had they known; got
—Could I use your car tomorrow morning?—Sure.I________a report at home. (2013·江苏，25)
#99440
A
will be writing
B
will have written
C
have written
D
have been writing