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【判断题】
在绘制网络图时，把活动画在一个闭路中是不允许的，因为它描述的是不断自我重复的活动路径。()A.
正确
B.
错误
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举一反三
【单选题】John plays the piano _____, if not better than, David. But he never shows off in public.
A.
as well
B.
as well as
C.
so well
D.
so well as
【单选题】He never plays sports or does outdoor activities with his family.
A.
很少
B.
经常
C.
从不
D.
偶尔
【单选题】Faced with a bill for $10,000，________.
A.
an extra job has been given to John
B.
the boss has given John an extra job
C.
an extra job has been taken
D.
John has taken an extra job
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