A survey suggests that the royal wedding of Prince William and Kate Middleton a great boost for British economy because a large number of visitors are expected to go.
A. will be
B. has been
C. was
D. be
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(答案→)A. will be
B. has been
C. was
D. be
解析：本题考查时态。根据宾语从句中because a large number of visitors are expected to go从句用一般现在时，故主句用将来时态。选A。