學位英語在線模擬：Please keep an eye on my luggage, and I'll be back ( ).
全北现代首发 www.epdbbc.com.cn Please keep an eye on my luggage, and I'll be back ( ).
B.in no time
C.at one time
D.at a time
【參考答案】B。本題考查介詞短語辨析。in no time“立刻，馬上”，可以和過去時、將來時搭配：in time“及時”;at one time“曾經”，用在過去時中;at a time“一次”，表頻率。
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