Being a teacher always encouraging students to think for themselves, I won't tell them answers until they __________ on a math problem for more than an hour.
#101395
A
have worked
B
will have worked
C
will have been working
D
had worked
推荐题目
--- Have you moved into the new office building?---Not yet .It ______
#100897
A
is decorating
B
has been decorated
C
is being decorated
D
has been decorating
This year the price of rice _____ about twenty percent. 
#101072
A
was raised
B
has been risen for
C
has risen by
D
has raised to
Teenagers________their health because they play computer games too much.
#99190
A
have damaged
B
are damaging
C
damaged
D
will damage