1._______getting to his office,he started his work.A.At B.By C.On D.In2.Mr.Black went to Japan on business on Oct.20,_________ happened to be his son's birthday.A.that B.which C.when D.it

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1._______getting to his office,he started his work.A.At B.By C.On D.In2.Mr.Black went to Japan on business on Oct.20,_________ happened to be his son's birthday.A.that B.which C.when D.it
1._______getting to his office,he started his work.
A.At B.By C.On D.In
2.Mr.Black went to Japan on business on Oct.20,_________ happened to be his son's birthday.
A.that B.which C.when D.it

1._______getting to his office,he started his work.A.At B.By C.On D.In2.Mr.Black went to Japan on business on Oct.20,_________ happened to be his son's birthday.A.that B.which C.when D.it
1.C on + ving 表示一.就.
2.B 非限制性定位从句,which在句子做主语

1。C
on doing 这个结构表示“一……就……”的意思
2。B
定语从句缺主语,且是非限定性定语从句,所有只能用which