[ Grammar ]
They ……………… continuously for the past three years.
A. travel
B. have yravelled
C. have been travelled
D. travelled

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Does the sentence below use a gerund?
My mom is cleaning in the kitchen.
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She is ………………….. student in my class.
A. most hard-working
B. more hard-working than
C. the most hard-working
D. hard-working