填空题

【参考答案】

在because后加of。
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单项选择题
The chief purpose of the contest is to ______.
A．make computer users aware of hacking
B．train hacking experts
C．enlighten people on how to prevent computer attacks
D．display the harms of hacking
单项选择题
In the past ______ years, the economy has been growing owing to tax cuts and Federal Reserve interest rate cuts.
A．2
B．3
C．4
D．5
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