— Why are you so popular with your students?— As a teacher, I seldom give my students so difficult a problem ____ they cannot work out.
#4683
A
as
B
that
C
if
D
which
推荐题目
----Have you known Professor Jackson in our department for a long time ? ----Yes, since he _____ the our university.
#4607
A
has come
B
comes
C
had come
D
came
.I dislike__________when I am left alone to start a conversation with a stranger.
#4779
A
that
B
this
C
it
D
one
The accident is reported to have occurred __________ the first Sunday in February.
#4899
A
at
B
on
C
in
D
to
Having concentrated for a long time he ____ his work, made some coffee and talked with his colleagues.
#4589
A
put on
B
put aside
C
put off
D
put back
Dressed untidily and speaking in a strange way, Father must have ______ to the people present to be a silly old man.
#4885
A
appeared
B
pretended
C
shown
D
thought