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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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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