Question

__________ for the science test all night long?*

a) The students had stuyied

b) Had the students studied

c) The students had studied

d)Had the students studyied​

Answer 1

la respuesta es la b

Answer 2

__________ for the science test all night long?*

a) The students had stuyied

b) Had the students studied

c) The students had studied

d)Had the students studyied

Answer:-$\boxed{ \rm \red{Had \: the \: students \: studied}}$