one choice questionthey've been expecting a splendid crop.that's what they've been ______.a.waiting b.waiting for c.waiting to d.waiting onwhy?thank!

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onechoicequestionthey''vebeenexpectingasplendidcrop.that''swhatthey''vebeen______.a.waitingb.waitingfor

one choice questionthey've been expecting a splendid crop.that's what they've been ______.a.waiting b.waiting for c.waiting to d.waiting onwhy?thank!
one choice question
they've been expecting a splendid crop.that's what they've been ______.
a.waiting b.waiting for c.waiting to d.waiting on
why?thank!

one choice questionthey've been expecting a splendid crop.that's what they've been ______.a.waiting b.waiting for c.waiting to d.waiting onwhy?thank!
B
waiting for sth.:等待某事(人,物)
其他三个答案没有这些用法

b.waiting for 现在完成进行时,他们一直在期待着的,相当于前文的they've been expecting

B. waiting for
waite for 固定搭配
本句后面省略了waiting for a splendid crop
如 we have to find a room to live in 一样,后面的介词是不能省略的