单选题
The illegal workers are ______.
A、
hard-working but costly.
B、
lazy but cheap.
C、
hard-working and ambitious
D、
hard-working and cheap.
【正确答案】
D
【答案解析】
第3段最后"by the ready supply of cheap，diligent，illegal labor"说明这些非法工人廉价、勤快。选D。
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