Her brother ______ in Canada at present.
Đáp án đúng là: C. is working
Giải thích:
The correct answer is 'is working' because it indicates an action happening now. 'At present' is a key phrase indicating the present continuous tense. The other options are incorrect because they use different tenses that don't fit the context of the sentence. 'Working' alone is not a complete verb phrase, 'works' is simple present, and 'work' is incorrect for subject-verb agreement.
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