Question

the boy really doesn't know

1.The boy really doesn't know ______ next.
A.where to do B.what to do C.how to do D.how to do it
为什么选D不选B
2.（Since） he mother was ill ,Mary had to look after her.
A.As B.When C.For D.Though
为什么选A

Answer 1

1.The boy really doesn't know ______ next.
A.where to do B.what to do C.how to do D.how to do it
为什么选D不选B
在很多情况下,what to do=how to do it.我想这里选D而不选B是基于next.这个男孩应该是知道接下来该做什么,但是不知道怎么做.个人之见.
2.（Since） he mother was ill ,Mary had to look after her.
A.As B.When C.For D.Though
为什么选A
as：因为.for也可以做“因为”讲,但是语气很弱.