Question

I_____all night long, and I must get some sleep now.

1. have been studying
2.was studying
3. studied
4.am studying​

Answer 1

Answer:

have been

Explanation:

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Answer 2

I__have been studying___all night long, and I must get some sleep now.

1. the above verb is in present perfect continuous tense.
2. the tense of the verb should always corresponds to the sentence.
3. verb means doing words that denotes action of the verb.
4. tense is the time when the action was happened whether in the past, present or future.
5. present perfect continuous tense are those verb that was started ealier and is still continuing.

so the correct option is 1. have been studying