Question

5. Dengue
(infects/is infecting/has been infecting) 5 percent of the world's population each year,and its range
(is increasing/has been increasing/was increasing).Though first infection may be mild , in rare cases, dengue (can causes / may causes /causes ) fatal internal bleeding.
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Answer 1

Answer:

Dengue infects 5 percent of the world's population each year ,and its range

is increasing Though first infection may be mild , in rare cases, dengue may causes fatal internal bleeding.

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Answer 2

Answer:

has been 5 percent of the world's population each year,and its range is increasing.Though first infection may be mild , in rare cases, dengue causes fatal internal bleeding.