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【单选题】
He is busy. He keeps ____ these days. [ ]A.
work
B.
to work
C.
works
D.
working
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【单选题】Which of the following networking methods allows us to show that the last % of one element cannot be completed until % of a previous element has been completed?
A.
PERT
B.
ADM
C.
PDM
D.
All of the above.
E.
A and C only.
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【单选题】Which element is expected to show the greatest tendency to form some covalent compounds?
A.
aluminium
B.
calcium
C.
magnesium
D.
sodium
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