________ anyone come to my office, please tell them I'm not available before four o’clock.
#66853
A
Might
B
Could
C
Would
D
Should
推荐题目
_______ a pair of compasses, it is easy to describe a circle.
#70488
A
Having
B
To have had
C
If you have
D
if having
The police got to ___ was once an old school ___the peasants used as a store .
#72361
A
what , that
B
where , which
C
where , that
D
which , where
My mother was looking while I         the radio. 
#41312
A
listened to
B
have listened
C
was listening to
D
is listening to
This is the book _____ the teacher spoke in class.
#70184
A
which
B
that
C
of which
D
of that