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【单选题】
双代号时标网络计划的特点之一是( )。(2009年试题第48题)A.
可以在图上直接显示工作开始与结束时间和自由时差，但不能显示关键线路；
B.
不能在图上直接显示工作开始与结束时间，但可以直接显示自由时差和关键线路；
C.
可以在图上直接显示工作开始与结束时间，但不能显示自由时差和关键线路；
D.
可以在图上直接显示工作开始与结束时间、自由时差和关键线路。
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举一反三
【单选题】The telephone _____ three times in the last hour, and each time it _____ for my sister.
A.
had rung; was
B.
has rung; was
C.
rang; has been
D.
has been ringing; is
【单选题】My sister went to the party and ________ had a good time there.
A.
she
B.
I
C.
her
D.
me
【单选题】Work on it had begun before my sister left. My sister left _________it had begun
A.
after
B.
without
C.
behind
D.
soon
【单选题】Work on it had begun before my sister left. My sister left ______ it had
A.
after
B.
without
C.
behind
D.
soon
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