Cover of Navigate Upper-Intermediate B2 - Workbook

Exercise 4b

8.1 - The Internet of Things·Navigate Upper-Intermediate B2 - Workbook

Question

Which of the relative pronouns in exercise 4a can be omitted?

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More exercises in 8.1 - The Internet of Things

Ex. 1
Ex. 2
Ex. 3
Ex. 4
Ex. 5
Ex. 6