Words like “but” and “although” are very obvious triggers of contrast in a sentence, but there are many other less explicit triggers that can be more difficult to spot. How is time used to indicate contrast in the following Sentence Completion question?

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In this sentence, the author uses the word “now” to illustrate a contrast. The expression of a contrast through time indicates that herbs and spices, although once considered to help preserve food, are now believed to have the opposite effect; thus, they are “teeming with” bacteria.