-What's up? You look worried.Well,I_____on the problem for 5 hours but I haven't got a single clue.
#100541
A
have worked
B
worked
C
will work
D
have been working
推荐题目
---How bright the sun is! ---You’d better wear your dark glasses to_____ your eyes from it.
#99663
A
protect
B
prevent
C
keep
D
stop
The mother didn't know who the glass because it happened when she was out.
#101735
A
break
B
has broken
C
had broken
D
breaks
What do you think the children______when we get home?
#103924
A
will do
B
are going to do
C
will be doing
D
are doing
Whatever may happen, go on until you succeed, and you _______ what life is all about.
#102853
A
will know
B
know
C
have known
D
will have known
These days, we _____ for our final exams.
#102111
A
are prepared
B
have prepared
C
are preparing
D
will prepare