1.

1). Can have been blind as2). Would been blind for3). Could been blind as4). Must have been blind as

Answer»

The verbs 'can', 'could' or 'would', all show a POSSIBILITY of SOMETHING occurring. But, the second sentence suggests a definite ACTIVITY, so the verb 'must' makes the most sense here, given the context.

Also, none of the sentences can form a grammatically CORRECT sentence, except option 4.

Therefore, the correct ANSWER is option 4.



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