Many British people have noticed that butterflies _______ from its natural habitats during the past several years.
#102940
A
are disappearing
B
have been disappeared
C
have been disappearing
D
will have disappeared
推荐题目
 I thought the teacher would say something about our exam result but he ________ it.
#99454
A
doesn't mention
B
hasn't mentioned
C
wouldn't mention
D
didn't mention
It is demanded that you ____ at six. 
#102746
A
will arrive
B
arrive
C
arrived
D
would arrive
I first met Mr Smith in America. He ________ at Stanford University then.
#100993
A
studied
B
had studied
C
is studying
D
was studying