[ Grammar ]
Rob _____ a problem while he _____ the surveillance system.
A. discover / checked
B. discovered / was checking
C. was discovering / checked
Select your answer:
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Modal Auxiliaries › View_______I_______ your telephone. I need to make a call.
A. must – use
B. may – uses
C. may – use
D. has to – use
Vocabulary and Grammar › View
She spoke English with a(n) _________ that I couldn’t understand.
A. accent
B. stress
C. intonation
D. tone