2. 外语
  3. AGorillas can communicate with a wide Bvariety of vocal calls, but they Ccould not use language Dto speak.

AGorillas can communicate with a wide Bvariety of vocal calls, but they Ccould not use language Dto speak.

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问题 AGorillas can communicate with a wide Bvariety of vocal calls, but they Ccould not use language Dto speak.
选项 A、 
B、 
C、 
D、 
答案C
解析 Could expresses past ability; a modal for present ability is needed with the simple present verb can communicate in the first clause. Correction: can.
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