[ Grammar for TOEFL ]
Rarely _____ located near city lights or at lower elevations.
A. observatories are
B. are
C. in the observatories
D. are observatories
Select your answer:

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Tenses › ViewAt this time last week, we ………………… my grandparents.
A. visited
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____ the problem sum many times to his student, Mr Tay gave out a sigh of frustration.
A. Have explained
B. Having explained
C. Have had explained
D. Have been explaining