问题描述：
No one told us _____,so we need your help.A.how
No one told us _____,so we need your help.
A.how should we do B.what should we do
C.how to do it D.what to do it
No one told us _____,so we need your help.
A.how should we do B.what should we do
C.how to do it D.what to do it
问题解答：
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