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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