[ Grammar ]
The migratory birds __________ before the temperature dropped.
A. had left
B. has left
C. left
D. leaved

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Grammar › ViewStella and Artyom are studying together. They help ____ prepare for the test.
A. themselves
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I was ______ at the concert, I am not interested in music.
a. boring
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What is he doing in the garden ?
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