Determine the tense of the sentence: 'They have been studying ...

★ Idiom and Tenses

Determine the tense of the sentence: ‘They have been studying for hours.’

A. Present Perfect Continuous Tense

B. Past Simple Tense

C. Future Simple Tense

D. Present Continuous Tense

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What does the idiom ‘hit the nail on the head’ mean?

A. To ignore the existing problem.

B. To try something new without a plan.

C. To do something half-heartedly.

D. To do something correctly or accurately.