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题型：语法填空（单句）题类：常考题难易度：普通

外研版（2019）高中英语必修三Unit 3 Period 3同步练习1

(trace) the source of the viruses soon, researchers are making a survey all related persons and creatures.

举一反三

This drug is less likely to cause side effects when ________ late in the day.

Children，when ______ by their parents, are allowed to enter the stadium.

Not all the problems a{#blank#}1{#/blank#} from social discrimination can be addressed through communication.

I decided to c{#blank#}1{#/blank#} an experiment.

She went about telling me the great difficulty that my mum had {#blank#}1{#/blank#} (bring) me up.

Sliding into the habit was easy, but it was difficult to {#blank#}1{#/blank#}（戒） the habit.

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