问题

John ,why are you so upset?—-I _________ my cellphone all morning but it is nowhere to be found
A:am looking for
B:have looked for
C:have been looking for
D:had looked for
B:have looked for
C:have been looking for
D:had looked for
正确答案是:
同类题型
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ourse very difficult, she decided to moveto a lower level.
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