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1 . 大火后,科学家们开始对袋鼠栖息地的消失感到担忧。(concern)
After fire, scientists_________________ the loss of habitat of kangaroos.
After fire, scientists
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2 . Parents are always ________ our safety wherever we are.
A.concerning about | B.concerned with |
C.concerning with | D.concerned about |
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