The hard life in the mountainous area he has adapted to ____ a real challenge to anyone. 
#101841
A
mean
B
means
C
meant
D
meaning
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
---John, why are you so upset? ---I­­­      my cell phone all morning but it is nowhere to be found.
#101303
A
am looking for
B
have looked for
C
have been looking for
D
had looked for
— Have you got any job offers?— No. I ______.
#101443
A
waited
B
was waiting
C
have waited
D
am waiting