[ Adverb Clauses ]
He couldn’t go to the party __________ he had to study for the exam.
A. unless
B. after
C. as
D. before

Random Topics:
Demonstrative Pronouns and Verb TensesArticles and DeterminersSubject-Verb AgreementSimple Past/Past ProgressiveConditionals and Modal VerbsPassive Voice in Past Simple TenseSimple PresentPresent TenseClauses of ReasonSuperlative AdjectivesOther quiz:
Grammar › ViewConcentration is ________ by alertness.
A. Help
B. Will help
C. Helps
D. Helped
Past Perfect Tense and Past Tense › View
When we were in elementary school, we ……… (not/learn) past perfect tense before we got English course.
A. have learnt
B. had not learnt
C. were learning
D. have not been learnt
Sentence Structure › ViewThe rain forest is disappearing, _______ many of its plants and animals are disappearing too.
A. but
B. and
C. or
Grammar › View
The driver __ the cat and tried to avoid it.
A. saw
B. was seeing
