— 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
The meeting was expected to start at 9 o'clock but the manager didn't turn up ______ twenty minutes later.
#5014
A
before
B
until
C
after
D
since
Determination is a kind of basic quality and this is _____ it takes to do jobs well.
#59076
A
why
B
that
C
which
D
what
Maybe you have been too many famous restaurants, but nowhere else _______ such spicy ducks.
#4543
A
can you taste
B
you can taste
C
do you taste
D
you taste