According to a UN report, some 844 animals and plants ______ in the last 500 years.
#102976
A
disappeared
B
were disappeared
C
have disappeared
D
had been disappeared
推荐题目
In the past twelve months the research members ______ the effectiveness of many materials in a home building.
#102889
A
had studied
B
would study
C
studied
D
have studied
The computer was invented in the 1940’s and ______ quite a lot ever since.
#100726
A
was changed
B
had changed
C
has been changed
D
will change
.---David. I’ve lost my keys again. ---Here, not again！You______ your keys.
#103868
A
always lost
B
always lose
C
are always losing
D
had been losing
---When will the expert come and give the lecture on economic development?---Not until our program_______.
#99532
A
is approving
B
is to approve
C
has been approved
D
will be approved
Progress _____ so far very good and we are sure that the work will be finished on time.
#104200
A
was
B
had been
C
has been
D
will be