Spot the error: They are tired because they ______

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Spot the error:

They are tired because they _______ in the garden since 9 O' clock.

Ahas been working

Bhave been working

Care working

DNone of the above

Answer:

ഒരു sentence ഇൽ time നെ കാണിക്കാൻ since ഉപയോഗിച്ചാൽ അവിടെ ഉപയോഗിക്കുന്ന tense , present perfect continuous ( has/have + been + ing ) ആണ്.