题目内容
（请给出正确答案）
[单选题]
Have you ever been to the Great Wall Every year_____________tourists visit it.
A.million
B.millions
C.million of
D.millions of
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发布时间：2022-01-07
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Finally, after four years of repeated attacks of sharp joint pain, a cancer expert found out Jane's problem and told her that she had developed joint cancer.
26-year-old Jane is now chairing the Public Awareness Committee. She works to raise public awareness of a disease that doctors often miss. She wants to use her experience to help others.
Since her mid-20s, Jane had been troubled by health problems-joint pain in her hands and feet at first, then her knees and back【11】and headaches. She consulted three doctors, but she was told there was nothing wrong with her【12】.
Finally, after four years of repeated attacks of【13】joint pain, a cancer expert【14】Jane's problem and told her that she had developed joint cancer.
26-year-old Jane is now chairperson of the Public Awareness Committee. She works to raise public awareness of a disease that doctors often【15】. She wants to use her experience to help others.
