[ Grammar ]
Thanh and Nam________ be in the same class, but I’m not sure.
A. can’t
B. must
C. could
D. might
Select your answer:

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Grammar › View_______ Ms. Belazi missed her connection, she had to take a later flight.
A. although
B. because
C. if
D. where
Modal Verbs › View
Despite his efforts, Tom ___ solve the complex problem. He approached it in a wrong way.
A. can’t
B. could
C. couldn’t
