Please leave your phone number we can get in touch with you in case of emergency. A. so t

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(答案→)A. so that
B. on condition that
C. for fear that
D. so long as
解析：词义辨析。so that以便，为的是；on condition that如果；for fear that以免，唯恐；so long as只要。请留下你的电话号码，以便紧急情况我们能和你取得连系。选A。