1.

1). had arrived2). arrived3). were arriving 4). arrive

Answer»

Correct option - 2

Here, concept of two PAST actions has been BROUGHT under consideration. When two past actions are joined with word LIKE before or after, then following pattern is followed :- 

Past perfect (1st action) + before + simple past (2nd action)

Simple past (2nd action) + after + past perfect (1st action)

Hence, arrived best FITS the blank. Thus, option 2 is the correct answer.

Correct SENTENCEThey had started the seminar before we arrived. 



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