题目内容
1. His joining in the research is really of great to us,otherwise we couldn't complete it in time.
A. enjoyment B. surprise
C. assistance D. amusement
1. C句意为:"他的加人对我们很有帮助,否则我们就不能及时完成这项研究。"enjoyment意为"享受";assistance意为"帮助";amusement 意为"消遣,娱乐"。所以选择。
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