Of the more than 1,300 volcanoes (A) in the world, only (B) about 600 can classify (C) as active (D) ones.
Of the more than 1,300 volcanoes (A) in the world, only (B) about 600 can classify (C) as active (D) ones.
volcanoes (A)
only (B)
classify (C)
active (D)