[ Relative Clauses ]
The reason _____ he left is unclear.
A. who
B. that
C. whom
D. whose

Random Topics:
PrepositionTOEIC Grammar and Vocabulary ReviewTOEICGrammar and ReadingArticles and Quantifiers-ing / Infinitivetake, make, doLexico and GrammarVocabulary : Coming & GoingIELTS VocabularyOther quiz:
Grammar › ViewNowadays, people ____ social networks with more and more caution.
A. uses
B. are using
C. used
D. use
Subject Verb Agreement › View
The roads _____ too rough and uneven.
A. are
B. is
C. was
D. am
Grammar › ViewI ____ the movie last weekend.
A. watch
B. watching
C. watched
D. watches
Vocabulary › View
What is the process of thinking of solutions and problem solving called?
A. Feedback
B. Troubleshooting
C. Empowerment
D. Composure
