— ______people travel every year?
— Perhaps when we are talking about it. More than 100 planes have taken off around the world.
A.How many | B.How much | C.How long | D.How often |
— ______people travel every year?
— Perhaps when we are talking about it. More than 100 planes have taken off around the world.
A.How many | B.How much | C.How long | D.How often |
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