情态动词表推测的用法 — 英语填空题
题目
The Mars rover sent a clear signal at 8:00. Its antenna can send a signal only when it is fully open, and the team confirmed that the signal came from the rover. The antenna ___ (be) fully open at 8:00.
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根据句意，用 have 或 has 加括号中动词的适当形式填空（过去…
have/has + 过去分词