the windows were very dirty,but he them at last.A、managed to cleanB、tried to clean C、tried cleaningD、managed cleaning为什么bcd不可以

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the windows were very dirty,but he them at last.
A、managed to clean
B、tried to clean
C、tried cleaning
D、managed cleaning
为什么bcd不可以

at last 说明他们最终做到了,所以用manage to clean .

A
三个答案都有设法去做的意思.
manage 设法做,最后做到了蔼 he did it!
try 尝试做,一般不成功的,只是尝试
manage to do 这是固定搭配,所以D选项被完全否定