[ Grammar ]
They have studied animal habitats ___ three months.
A. for
B. since
C. from

Random Topics:
Phrase vs ClauseRun-On SentencesAdjectives and ArticlesFood VocabularyIf ConditionalsTenses and VerbsPast Simple Tensea, an, the, zero articleModals - Have to or ShouldModals - Conditionals - Future TensesOther quiz:
Verb Tenses and Usage › View. We ___ in this house since 2012.
A. have lived
B. lived
C. are living
Grammar › View
the tortoise walks ____
A. quick
B. slowly
C. good
Idioms › ViewLook! The sign says: “Keep ___ the grass”.
a. out
b. off
c. away
Mixed General Quiz › View
I’ll buy a ___ of corn flakes.
a. bag
b. jar
c. box
