_____ by a large audience, he felt very nervous and didn't know what to say.
本题考查过去分词作原因状语。这里watch的非谓语动词和he之间是被动的逻辑关系:因为被一大群观众看着,他才感到很紧张,不知道说什么好。
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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