2019年mpa考试英语真题——非谓语动词623

{01}He must have gone out. I heard the noise of the door ______when I was still in bed.
A.being locked
B.to lock
C.locking
D.having locked
解析：考查非谓语动词和固定用法。句意“他一定是出去了。当我没起床时，我就听见了锁门声。”door和lock之间是被动关系，应该用被动语态。hear sb./sth. doing sth.“听到正在做某事”。故选A。
本题选A。

{02}Once________，it can never be forgotten．
A.see
B.to be seen
C.seen
D.saw
解析：过去分词seen表示“被看见”，当它作时间状语时，可由once，when，whenever，while，until等连词引起，如：Once recovered he threw himself into his work．他病一好，就立即投入工作。
本题选C。