Topics: Modal Verbs
They built this huge temple 1000 years ago. This ______ a great civilization.
A. should have been
B. must have been
C. could have been
D. can’t have been
Select your answer:
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Grammar › ViewMany British people let ………. fireworks on Guy Fawkes Night.
A. up
B. on
C. off
D. in
Vocabulary › View
working to discover something
A. detecting
B. detecting
C. vary
D. unobserved