题目内容
16．He looks upset．He doesn't know ________．（ ）| A． | what to do it | B． | how to do it | C． | how to do | D． | do what |
分析 他看起来很不安．他不知道怎样做它．
解答 答案：B．根据本句放在He doesn't know之后，可知本句是宾语从句．在宾语从句中所使用的语序应该是陈述句语序，故排除D．选项A中do是及物动词，what在这里作do的宾语，后面不需要再加it，排除掉；选项C中do是及物动词，后面需要跟名词或者代词作宾语，how是个副词，不能作宾语，do后面需要加it，应排除掉．故选B．
点评 此题考查宾语从句．考生在答题时要注意"宾语从句必须采用陈述语序"，根据上下文语境确定合适的选项．
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