However, the U.S. Department of Homeland Security does 40 use the technology for checking employees into some areas and for travelers enrolled in its PreCheck program.
Auntimely
Bcurrently正確答案
Cpreviously
Dspontaneously
答案與詳解
currently 意為「目前、現在」,與句中現在簡單式 does use 時態完全吻合,表示國土安全部「目前」確實使用該技術。
