Old people must be looked after well and _D__ politely A.speak to B.spoken C.speak D.spoken to

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Old people must be looked after well and _D__ politely A.speak to B.spoken C.speak D.spoken to

Old people must be looked after well and _D__ politely A.speak to B.spoken C.speak D.spoken to
Old people must be looked after well and _D__ politely A.speak to B.spoken C.speak D.spoken to

Old people must be looked after well and _D__ politely A.speak to B.spoken C.speak D.spoken to
and连起来两个成份,忽视前半句,就是
Old people must be ___ politely.
很容易判断是D.本来是speak to old people politely,改成被动式.

spoken to
主动语态是speak to old people politely
所以被动语态中的to 不能省略