题目内容
EBOLA(埃博拉) is said_______ another big health challenge to our humans over the past several months .
A. becoming B. to become
C.having become D. to have become
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题目内容
EBOLA(埃博拉) is said_______ another big health challenge to our humans over the past several months .
A. becoming B. to become
C.having become D. to have become