1). Has been2). Have been3). Been4). No improvement

1.	1). Has been2). Have been3). Been4). No improvement
Answer» The CORRECT answer is Option 2, i.e., $‘have been’. The sentence needs IMPROVEMENT because it is GRAMMATICALLY incorrect and doesn’t make complete sense in its current FORM.$ On using ‘have been’, the sentence then becomes $‘That must have been difficult for you’, which is both grammatically correct and makes perfect sense.$ The other two options- ‘has been’ and ‘been’- make the sentence grammatically incorrect and fragment its sense, for ‘must’ is never followed by ‘has’ or simply ‘been’.$

Answer»

The CORRECT answer is Option 2, i.e., $‘have been’.

The sentence needs IMPROVEMENT because it is GRAMMATICALLY incorrect and doesn’t make complete sense in its current FORM.$

On using ‘have been’, the sentence then becomes $‘That must have been difficult for you’, which is both grammatically correct and makes perfect sense.$

The other two options- ‘has been’ and ‘been’- make the sentence grammatically incorrect and fragment its sense, for ‘must’ is never followed by ‘has’ or simply ‘been’.$

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