Question 31: Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions. Question 30. By 2050, the population in this area is expected to double what of 2002.
Knowledge of substitute words
By 2050, the population of this region is expected to double what it was in 2002.
=> Here, people compare the population in 2002 with 2050, without repeating the noun population for the second time, so we can use that instead.
=> Answer D. (what -> that)
Other structures to note
– expect to do sth: hope to do
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