Junk messaging has been a headache for years, ＿＿the action taken by the authori-ties has not yet produced the results expected
| A．as | B．but | C．so | D．before |
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Junk messaging has been a headache for years, ＿＿the action taken by the authori-ties has not yet produced the results expected
| A．as | B．but | C．so | D．before |
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