95-08-24
A conductor [used ] signals and gestures to let the [musicians ] [to know ] when [to play] various parts of a composition.
答案是C ,为什么呢?let sb. (to) do ,"to"不是可要可不要吗?还有"when to play"没有语法错误吗?
挺困惑的!
只有let sb do sth 是正确的,不可以加to。
when to play 是正确的。再举一个例子:In such a complicated situation, nobody knows what to do next.
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