The line is busy; someone (should be using) the telephone now. (Match the best alternative that correspond to the bracketed word of phrase in the sentence)

A must be using
B should be using
C must have used
D should have used

Correct Answer: must be using

প্রথম বেসরকারি ব্যাংক আরব - বাংলাদেশ ব্যাংক।
Bissoy MCQ

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