be busy with sth,表示“忙于某事”,本例选择with,意思是,张先生周末忙于办公室的工作.
后面happened,就是happen的过去时.因为是过去发生的事导致了现在不开心.
Mr.Zhang has been busy __his office work on weekdays this mouth.A.with B.to C.for D.in
Mr.Zhang has been busy __his office work on weekdays this mouth.A.with B.to C.for D.in
Oh,little Tom seemed to be sad.I guess something ___(happen)to him.
Oh,little Tom seemed to be sad.I guess something ___(happen)to him.
其他人气：478 ℃时间：2019-08-21 15:13:21
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