They want to know ________ do to help us．
They want to know ________ do to help us．
A.what can they
B.what they can
C.how they can
D.how can they
答案及解析： B
首先要选择间接引语部分是陈述词序的选项；第二要考虑疑问词的正确使用，从句子结构来看，间接引语部分的谓语do缺少了宾语，因此应选择连接词what充当do的宾语。
They want to know ________ do to help us．
A.what can they
B.what they can
C.how they can
D.how can they
答案及解析： B
首先要选择间接引语部分是陈述词序的选项；第二要考虑疑问词的正确使用，从句子结构来看，间接引语部分的谓语do缺少了宾语，因此应选择连接词what充当do的宾语。