_________ the whole process for the studies of cancer took more than a year, the technology is moving so fast that it will soon take just weeks．
| A．How | B．Because | C．If | D．While |
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_________ the whole process for the studies of cancer took more than a year, the technology is moving so fast that it will soon take just weeks．
| A．How | B．Because | C．If | D．While |
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