[ Tenses ]
Which tense is used for a past action that happened before another past action?
A. Past Perfect Tense
B. Simple Past Tense
C. Present Continuous Tense
D. Present Perfect Continuous Tense

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A. It’s
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Did you know that camels were first imported ___ Australia in 1840 and that now Australia has the biggest number of wild one humped camels in the world?
a. for
b. in
c. to