[ Grammar ]
The teacher has been concerned __________ some time now.
A. of
B. for
C. too
D. since

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Modals › ViewI can sing now but I ________ sing very well when I was a child.
A. can’t
B. must
C. could
D. couldn’t
Grammar › View
_______ they twins? They look the same.
A. Is
B. Did
C. Are
D. Was
