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【单选题】
2 两人射击，B击中目标的概率为0.8，A、B都击中目标的概率为0.6，那么在B击中目标的情况下，A击中目标的概率为A.
0.4
B.
0.6
C.
0.75
D.
0.5
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举一反三
【单选题】It was not until Susan came back ______her close friends were waiting for him.
A.
which she knew
B.
which did she know
C.
that she knew
D.
that did she know
【单选题】She gazed at the carpet for some time. She it.
A.
watched
B.
stared at
C.
glanced at
D.
had a glimpse of
【单选题】She gazed at the immense expanse of the sea.
A.
extension
B.
very large area
C.
big gap
【简答题】She gazed at ___________ (她水中的倒影).
【单选题】She gazed at the _________ infant and smiled.
A.
concise
B.
newborn
C.
handsome
D.
stylish
【单选题】Not until John came to China what kind of country she is.
A.
did he know
B.
he knew
C.
he didn’t know
D.
he could know
【单选题】It was not until she came to see us ____ her mother was ill in bed.
A.
when we knew
B.
that did we knew
C.
that we knew
D.
that did we know
【单选题】Not until she came back ______ she was OK.
A.
that I knew
B.
I knew
C.
did I know
D.
I have known
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