[ Grammar ]
The role of the architect, though changing, _____ been central to the successful and sometimes less than successful design and implementation of pleasingly built environments in which people live.
A. has
B. have

Random Topics:
Adverbs by TypeFirst ConditionalsDefinite and Zero ArticleSimple TensesAdjectivePerfect ModalsGrammar - Present and Past PassivePronouns and AdverbsComparison and ModalsAdjective & AdverbsOther quiz:
Grammar › ViewHave you ever ________ to Shanghai?
A. been
B. gone
C. been in
Tenses › View
Can I have ___ cakes, please?
A. a
B. an
C. some
D. any
Grammar › ViewChoose the correct option. They ________ to the concert last night.
A. didn’t go
B. don’t go
C. doesn’t go
Time Clauses of Future › View
First, I will talk to the director. Then, I will take a decision.
A. I won’t take a decision until I talk to the director.
B. I won’t take a decision untill I talk to the director.
C. I won’t take a decision until I will talk to the director.
