[ Present Perfect Continuous Tense ]
They ……… in Medan for 6 months. (stay)
A. have been staying
B. has been staying
C. has stayed
D. are staying

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Grammar and Vocabulary › ViewThe sun is a very important …… of energy.
A. source
B. force
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Jill_______her sister in London next week. She bought her plane ticket weeks ago!
A. is going to visit
B. will visit
C. are visiting