请问句中的be动词为什么要用原型?Within weeks Matthews was letting it be known that he would appreciate aninvitation to meet the Prime Minister at Downing Street.句中的letting be known that为什么要用be动词原型,还有appreciate

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请问句中的be动词为什么要用原型?Within weeks Matthews was letting it be known that he would appreciate aninvitation to meet the Prime Minister at Downing Street.句中的letting be known that为什么要用be动词原型,还有appreciate
请问句中的be动词为什么要用原型?
Within weeks Matthews was letting it be known that he would appreciate aninvitation to meet the Prime Minister at Downing Street.
句中的letting be known that为什么要用be动词原型,还有appreciate 在句中是什么呢意思?

请问句中的be动词为什么要用原型?Within weeks Matthews was letting it be known that he would appreciate aninvitation to meet the Prime Minister at Downing Street.句中的letting be known that为什么要用be动词原型,还有appreciate
let sb.do sth..
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