At that time, the study on the development of vaccines became more urgent, as the pandemic heightened people’s worries.

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问题 At that time, the study on the development of vaccines became more urgent, as the pandemic heightened people’s worries.

选项 A、intensified
B、lowered
C、accelerated
D、slowed

答案A

解析 heighten(加强);intensify(加强,增强);lower(降低);accelerate(加  速);slow(减缓)。
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