At the moment our <a href="###">technology</a> is more <a href="###">advanced</a> than theirs, but they are ______________ fast.(单选题)<br>.catching up.,.<br>catching on.,.<br>catching at.,.<br>catching out

At the moment our <a href="###">technology</a> is more <a href="###">advanced</a> than theirs, but they are ______________ fast.(单选题)
.catching up.,.
catching on.,.
catching at.,.
catching out

出自：2024年国家开放大学答案

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