问题补充：
--- Haven’t seen you for ages! Where have you been?
--- I have seldom had any chance to come back to the hometown I was sent to Beijing the project.
A. as; in the charge of
B. since; in charge of
C. as; in charge of
D. since; in the charge of
答案：
A. as; in the charge of
(答案→)B. since; in charge of
C. as; in charge of
D. since; in the charge of
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