There is no way of knowing why one man makes an important discovery ______ another man, also intelligent, fails.
#30143
A
since
B
if
C
as
D
while
推荐题目
Have you noticed the problem ________ he is now in low spirits？________ come?
#30464
A
where；What
B
that；How
C
in which；For
D
what；As
The eldly are treated with respect and the young are given____.This is a harmonious family__grandparents ,aunts and uncles may well live very near the immediate family.
#34085
A
love, which
B
happiness, in which
C
affection, where
D
care, whose
It’s quite common in Britain to say “Thank you” to the drivers __ people get off the bus.
#33878
A
after
B
since
C
until
D
when
—What's the party like?—Wonderful.It's years________I enjoyed myself so much.
#30060
A
after
B
when
C
before
D
since