The new safety problem of contaminated（受污染的）milk is much more widespread， at least 22 dairy companies and their milk products that have appeared nationwide.
| A．to involve | B．involved | C．involving | D．being involved |
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The new safety problem of contaminated（受污染的）milk is much more widespread， at least 22 dairy companies and their milk products that have appeared nationwide.
| A．to involve | B．involved | C．involving | D．being involved |
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