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【参考答案】

本文用的是一般现在时，故had应为has。
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The explanation of animal-behaviour experts for the clever behaviour of pets is______.
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A．It helps develop our personalities.B．It enables us to acquire first-hand knowledge.C．It makes our life more interesting.D．It brings about changes in our lifestyle.
A．It helps develop our personalities.
B．It enables us to acquire first-hand knowledge.
C．It makes our life more interesting.
D．It brings about changes in our lifestyle.
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