7.____ the time the police arrived,more than 300 people were shot dead.A) At B) As C) By D) When

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7.____thetimethepolicearrived,morethan300peoplewereshotdead.A)AtB)AsC)ByD)When7.____thetimethepolice

7.____ the time the police arrived,more than 300 people were shot dead.A) At B) As C) By D) When
7.____ the time the police arrived,more than 300 people were shot dead.
A) At B) As C) By D) When

7.____ the time the police arrived,more than 300 people were shot dead.A) At B) As C) By D) When
C, BY. 表示时间关系,在.到来时.

D 当…时

C

C

选C,意思是当警察来时…,by the time 是固定短语,再结合这里的语境应该选C