问题补充:
He asked them to come to his office one .
A. at a time
B. at all time
C. at times
D. at one time
答案:
(答案→)A. at a time
B. at all time
C. at times
D. at one time
解析:考查词组:A. at a time一次B. at all time一直C. at times有时D. at one time曾经,句意:他叫他们一次一个去他的办公室。选A。
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