单选题
Before adding new stocks ______ your investment portfolio, why not attend one of our investment seminars, where you will be able to meet our consultants in a small group setting?
A、
at
B、
to
C、
for
D、
with
【正确答案】
B
【答案解析】
本题需选择适当的介词。根据句意，应取add A to B(把A加到B)的结构，故选(B)to。
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