Question

They___________
since last October
1) have travelled
2)will have travelled
3)have been travelling
4)has been travelling​

Answer 1

answer: They have been travelling since last October.

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Answer 2

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3) Have been travelling is your answer.

They have been travelling since last October.

Explanation:

The sentence which comprise conjunctions like "since" and "for" mainly use perfect progressive (continuous) tense. This indicates that the action mentioned in the sentence is ongoing at the present moment.

The sentence structure to form a present progressive sentence:

Subject + has/have been + [verb + ing] + object.

Continuous tense is used when we need to convey:

✦ an action happening/ongoing

✦ an action happening frequently

✦ an action going to take place

hope i helped mate...!!!