21. Rod Ellis (2006) offered some of his own answers to questions aboutwhen and how toteach grammar. Which of the following statementsis not his assertion?
(A) Corrective feedback can facilitate acquisition if itinvolves a mixtureof implicit and explicit feedback.
(B) Explicitgrammar teaching is more effective at the beginning levelsthan intermediate to advanced levels.
(C) Both deductive and inductive approaches can be useful,depending on the context and purpose of instruction.
(D) Both form and meaning should be emphasized; learners need tohave the opportunity to practice forms in communicative tasks.