题目内容
You can ______, so long as you're sure you can pay the monthly instalment. (buy on credit)
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Many migrant workers who leave their children behind in the countryside ______ about having failed to perform their role as parents. (guilt)
When Mom ______ of their marriage, she couldn't help wondering how they had managed on with so little money then. (look back on)
线程是进程的另一种称呼。
一个进程可以有多个线程，而且至少有一个可执行线程。
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