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A; the A.; / The ; / The ;a
A;the A;/ The;/ The;a
mustn’t that haven’t they don’t they doesn’t it
are; are is; are is; is are; is
why because of because what
Some 260 million people in the world have an adequate working knowledge of English. There are some 260 million native speakers of English in the world. It is almost impossible to estimate the number of people with an adequate working knowledge of English. People learn English for a variety of reasons.
asking native speakers for explanations reading good books in the foreign language comparing their speech with that of native speakers paying no attention to them while speaking
A, the A, / The , / The, a
The, / A; / A; the The; a
/... the the/... the... the
are ; are is ; are is ;is are ;is
asking native speakers for explanations reading good books in the foreign language comparing their speech with that of native speakers speaking without regard to native speakers
mustn’t that haven’t they don’t they doesn’t it
why because of because what
两台发动机都是蓝系统 ENG2绿系统，ENG1黄系统 ENG2黄系统，ENGl绿系统 ENG2蓝系统，ENGl绿系统
A; the A; / The ; / The; a
asking native speakers for explanations reading good books in the foreign language comparing their speech with that of native speakers paying no attention to them while speaking
the large number large number a large number a great deal
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