26．The researehers delermine what type of plants the virus can infect(感染) and____insects can carry the virus.
| A．those | B．why | C．which | D．How |
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26．The researehers delermine what type of plants the virus can infect(感染) and____insects can carry the virus.
| A．those | B．why | C．which | D．How |
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