[ Modals for Deduction ]
She must be the lead singer; she has the microphone. What deduction can you make?
A. She is likely the lead singer.
B. She is just a backup singer.
C. She is not involved in the performance.
D. She is definitely not the lead singer.

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Recently, I _______ really hard because end-of-term tests are coming.
A. have been working
B. have worked
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