Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology.
#31596
A
after
B
before
C
since
D
when
推荐题目
Tim is in good shape physically_______ he doesn’t get much exercise.
#31842
A
even though
B
if
C
unless
D
as long as
—May I go outside and play for a while, Dad?—No, you can’t ____ your homework is being done.
#34531
A
until
B
as
C
before
D
the moment
There are two spare rooms upstairs, ________ measures five meters across.
#33914
A
the larger of them
B
the larger of that
C
the larger of which
D
the larger of whom
In some places, women earn money ________ men work at home and raise their children.
#30848
A
and
B
when
C
while
D
though