這里是to引導的介詞短語做proposals的后置定語,而這里顯然不是主動的動作,所以又用了被動語態(tài).至于D嘛,是現(xiàn)在完成進行時,不適合用在這種語境,意思和時態(tài)也不對.
現(xiàn)在完成進行時
其構成形式如下：
I / we / they have
He / she / it has been + 動詞的現(xiàn)在分詞
1） 表示一個在過去開始而在最近剛剛結束的行動,如：
Ann is very tired.She has been working hard.
Why are you clothes so dirty?What have you been doing?
2) 表示一個從過去開始但仍在進行的行動,如：
It has been raining for two hours.(現(xiàn)在還在下)
Jack hasn’t been feeling very well recently.
3) 表示一個從過去開始延續(xù)到現(xiàn)在,可以包括現(xiàn)在在內的一個階段內,重復發(fā)生的行動,如：
She has been playing tennis since she was eight.
4) 現(xiàn)在完成時強調動作行為的結果、影響,而現(xiàn)在完成進行時只強調動作行為本身,如：
Tom’s hands are very dirty.He has been repairing the car.
The car is going again now.Tom has repaired it.