题文
Smoking is one of the ______ cause of cancer, killing millions of people each year.
| A．major |
| B．similar |
| C．appropriate |
| D．casual |
推荐试卷
Smoking is one of the ______ cause of cancer, killing millions of people each year.
| A．major |
| B．similar |
| C．appropriate |
| D．casual |
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