writing questtion

<p>It was not until 1982, the year two major supermarket chains began replacing paper bags with plastic ones, when the use of plastic shopping bags became widespread.</p>

<p>A) began
B) with
C) when
D) became
E) No error </p>

<p>what's thee answer and why?</p>

<p>E i think. Because they’re all correct?</p>

<p>the answer is C, but why?</p>

<p>“When” should be replaced with “that” for the sentence to become coherent.</p>