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**example from April 2018 paper test Writing question 20 (slightly modified here): | **example from April 2018 paper test Writing question 20 (slightly modified here): | ||
20. Finally, traditional methods of storage | 20. Finally, traditional methods of storage | ||
________ heat to compress the air, which can | |||
lower the energy efficiency of the process. | lower the energy efficiency of the process. | ||
A) | A) requires | ||
B) had required | B) had required | ||
C) does require | C) does require | ||
D) require | D) require | ||
*the question is trying to trick the student into thinking that the object of the preposition, "of" is the subject of the sentence: | *the question is trying to trick the student into thinking that the object of the preposition, "of" is the subject of the sentence: |