He had just sent an email to his pal on the Internet ________ the system broke down.
#30932
A
while
B
when
C
after
D
since
推荐题目
The value of life lies not in many days we live, but in ____ use we make of them.
#31891
A
that; which
B
what; that
C
how; what
D
what; how
Schools in the cities are well equipped those in the countryside are poor．
#30153
A
if
B
while
C
so
D
as
_______ laws of motion are simple, motion, as we see it in the world about us, certainly is not.
#34130
A
When
B
While
C
As
D
Even
Cathy had quit her job when her son was born _______ she could stay home and raise her family.
#29998
A
now that
B
as if
C
only if
D
so that
Wishing to get a million in the lottery， many among us now do，is simply foolish．
#33513
A
which
B
what
C
as
D
that