In 1620,about half of the USA___covered by forest A:are B:is C:were D:was 选几?急答!

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In1620,abouthalfoftheUSA___coveredbyforestA:areB:isC:wereD:was选几?急答!In1620,abouthalfoftheUSA___cover

In 1620,about half of the USA___covered by forest A:are B:is C:were D:was 选几?急答!
In 1620,about half of the USA___covered by forest A:are B:is C:were D:was 选几?
急答!

In 1620,about half of the USA___covered by forest A:are B:is C:were D:was 选几?急答!
was