Gorillas have a wide range of calls that help them______information.

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问题 Gorillas have a wide range of calls that help them______information.

选项 A、convey
B、conveyed
C、are conveying
D、to be conveyed

答案A

解析 The causative help is followed by an infinitive, in this case, with to omitted: convey.

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托福（TOEFL）

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