问题
选择题
Betty and Hector __________ at Beijing International School __________ last year.[ ]
A. are, since
B. have been, for
C. has been, since
D. have been, since
答案
答案：D
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Betty and Hector __________ at Beijing International School __________ last year.[ ]
A. are, since
B. have been, for
C. has been, since
D. have been, since
答案：D