学位英语在线模拟：Please keep an eye on my luggage, and I'll be back ( ).
Please keep an eye on my luggage, and I'll be back ( ).
B.in no time
C.at one time
D.at a time
【参考答案】B。本题考查介词短语辨析。in no time“立刻，马上”，可以和过去时、将来时搭配：in time“及时”;at one time“曾经”，用在过去时中;at a time“一次”，表频率。
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