The genetic engineering, ______ progress has been very rapid recently, is perhaps the most important of all the sciences．
#69473
A
to which
B
with which
C
in which
D
for
推荐题目
My brother is always making good use of the time _______ he can spare.
#71516
A
when
B
in which
C
while
D
that
Though the key was pressed, nothing ______ on the screen.
#41230
A
appeared
B
was appeared
C
appears
D
is appeared
—I was ______ tired ______ I fell asleep as soon as I lay down. —Oh, you need to have a good rest.
#41097
A
too, to
B
so, that
C
enough, to
D
such, that