Text V, for questions from 29 through 33.
Based on the fragment below, choose the incorrect alternative.
Therefore, it must be a valid claim that the most important professional duty that non-NESTs have to perform is to make linguistic improvements in their English.
The word Therefore is synonymous with hence and thus.
The word must is a modal auxiliary verb. It indicates that it is necessary or very important that something happens.
The first and the second that are subordinating and correlative conjunctions respectively.
The word "duty" is a countable and uncountable noun. As a countable noun its plural form is duties.
The possessive adjective their refers to non-NESTs.
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