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TOEIC Reading 5 Exercisee 165

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Question: 
O:8:"stdClass":2:{s:8:"question";s:94:"The Zambian economy increases the inflow of foreign exchange into the country by ______exports";s:7:"choices";a:4:{i:0;s:8:"increase";i:1;s:10:"increasing";i:2;s:9:"increased";i:3;s:9:"increases";}}
Answer: 
b
TOEIC Reading 5 Category: 
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answer explanation: 

<p>The correct answer is <strong>(B) increasing</strong>.</p><p><span style="font-size: 13.008px;">The key preposition here is "by." The word "by" is often followed by a gerund, which is the "-ing" form of a verb. This is because a gerund functions as a noun and is used to indicate the means or method by which something is done. So, the answer is&nbsp;</span><span style="font-size: 13.008px;">&nbsp;</span><span style="font-size: 13.008px;">(B) increasing&nbsp;</span><span style="font-size: 13.008px;">- This is the gerund or "-ing" form of the verb. This form can act as a noun and, as such, can follow the preposition "by" to indicate the method or means of action.</span><span style="font-size: 13.008px;">&nbsp;</span></p>