He _______ around the clock since June, when the first Ebola case appeared in this agricultural county.
| A．had been working | B．has been working |
| C．is working | D．was working |
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He _______ around the clock since June, when the first Ebola case appeared in this agricultural county.
| A．had been working | B．has been working |
| C．is working | D．was working |
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