问题
选择题
The danger of HINI was real, especially in the beginning,_____ little was known about the new disease.[ ]
A. if
B. because
C. when
D. before
答案
答案：C
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The danger of HINI was real, especially in the beginning,_____ little was known about the new disease.[ ]
A. if
B. because
C. when
D. before
答案：C