1) The police ______ the murderer everywhere when he suddenly appeared in a theatre. a) is searching for b) were searching for c) are searching for d) were searching 2) The whole class ______ the teacher attentively. a) are listening to b) is listening to c) are listening d) is listening 3) Neither you nor Lily ______ to the Great Wall before. a) had been b) has gone c) has been d) have been

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