It
signalled
signalled
the great progress this country had made in rocket technology. （to be a sign that something is going to happen）

【答案】signalled

【解答】

【点评】

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发布：2024/5/23 20:38:36组卷：1引用：1难度：0.7

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It signalledsignalled the great progress this country had made in rocket technology. （to be a sign that something is going to happen）