1.He doesn't know________.A.when to do B.what to do C.how to do D.where to do2.He came ___ (forty)in this English test.

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1.He doesn't know________.A.when to do B.what to do C.how to do D.where to do2.He came ___ (forty)in this English test.
1.He doesn't know________.
A.when to do B.what to do C.how to do D.where to do
2.He came ___ (forty)in this English test.

1.He doesn't know________.A.when to do B.what to do C.how to do D.where to do2.He came ___ (forty)in this English test.
1.选B
ACD最后都要加上it
但是 what to do=how to do it,所以选B
2.fortieth,第四十名,用序数词
俊狼猎英

1. B。 这里另外三项都不可以选的原因是do缺宾语，只有B的what 可以做do 的宾语。其他三项都要加上it 才对。
2. the fortieth 意思是第四十名。

1.C 2. fortieth

1.B 他不知道该做什么
2.fortieth 他在英文考试中排名第四十

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