[ Tenses ]
Past Perfect Continuous: By noon, they ________ the marathon for three hours.
A. run
B. ran
C. running
D. had been running
Select your answer:
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Grammar › ViewThe iPod is over _________.
A. they’re
B. there
C. their
Infinitives and Gerunds › View
It is easy ____ this topic.
A. understanding
B. to understand