问题
Scientists ______ SARS for several monthsbefore a major discovery was made in the field
A:a cottonpurple expensive
B:an expensivepurple cotton
C:a purpleexpensive cotton
D:a cottonexpensive purple
B:an expensivepurple cotton
C:a purpleexpensive cotton
D:a cottonexpensive purple
正确答案是：
同类题型
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