Fill in the gaps. She ... (read) that book for two hours.

The correct answer is 'has been reading'. Explanation: The sentence 'She ... (read) that book for two hours' requires the use of the present perfect continuous tense. This tense is used to describe an action that started in the past, is still continuing, and has been happening for a certain duration. In this case, the duration is 'for two hours'. Let's go through why other options are incorrect: * 'read': This is the base form of the verb 'to read'. It does not fit the context, as it does not convey that an action has been ongoing for some time. * 'have read': This is the present perfect tense, which indicates a completed action that has relevance to the present. It doesn't suit the sentence because the action is still on. * 'has read': Similar to 'have read', 'has read' is a present perfect tense form, and it also suggests a completed action. It doesn't fit the context that says the action has been ongoing for two hours. Therefore, 'has been reading' is the correct choice as it reflects that the reading action started in the past and has been ongoing for a specified duration, which is 'for two hours'.