I don't know why he is late. He ________ be ...

[ Grammar ]

I don’t know why he is late. He ________ be stuck in traffic.

A. must

B. might

C. can’t

D. couldn’t

Select your answer:

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Which is the correct sentence?

A. They rarely stay here for more than two days
B. They stay here for more than two days rarely
C. They stay rarely here for more than two days

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I am old enough to travel alone, ___?

A. aren’t I

B. am I

C. don’t I