Answer the following question below and choose the option that best completes the gap(s)

This professor of...........medicine has......... the mystery of bird flu.

Dwise12

8 years ago

Ye ur rt de options re wrong,D is surpose b de ans buh unravalled is wrng, so my school pls update

MGnSF8

1 year ago

In this question your correct answer which is d unravelled is spelt with double 'l', but in the explanation it is spelt with a single 'l'.
Which of them am i to follow please ?