[ Tenses ]
They (not visit) their grandparents last summer.
A. They did not visit their grandparents last summer.
B. They have not visited their grandparents last summer.

Random Topics:
So, Such, Many, MuchTake or PutVerb PatternsVerbs with Prepositions and ConjunctionsContinuous TensesQuantifiers & Modals of ObligationContractions and ConjunctionsModal VerbPrepositions of Time & PlaceComparison DegreeOther quiz:
Preposition Form › ViewChoose the correct option to fill in the blanks with suitable prepositions.
The principal was thankful to the students who had brought ___________ the issue underlying the conflict.
A. forth
B. about
C. out
D. in
Grammar › View
(it start) _____to rain?
A. Do it starting
B. Is it starting
C. Are it starting
D. Does it starting
Grammar › ViewI have to attend tuition class _____ 5.30pm.
A. in
B. on
C. at
Grammar › View
Oil is a uncountable noun.
A. TRUE
B. FALSE
