Yesterday we __ an expert to help solve this problem.A called in B.called at C called for选哪个
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Yesterday we __ an expert to help solve this problem.A called in B.called at C called for选哪个
Yesterday we __ an expert to help solve this problem.A called in B.called at C called for选哪个
Yesterday we __ an expert to help solve this problem.A called in B.called at C called for选哪个
call in
请求收回;请来
called at
到...作短暂访问
called for
需要
所以选A词组的搭配要是实在区别不开意思就主要看介词
A
c
选A，call in 有下面几个意思
1.叫(某人)进来; 来访
Call in this evening if possible.
可能的话今晚来一趟。
Please call Kehr in.
请凯尔进来。
2.找〔请〕来
How many friends will you call in?
你将邀请多少位朋友?
A ...
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选A，call in 有下面几个意思
1.叫(某人)进来; 来访
Call in this evening if possible.
可能的话今晚来一趟。
Please call Kehr in.
请凯尔进来。
2.找〔请〕来
How many friends will you call in?
你将邀请多少位朋友?
A lawyer is often called in to write a will.
律师常被请来写遗嘱。
3.用电话通知; 打电话来（工作单位等）
The director has just called in to say that she'll be late.
主任来电话说她要迟些时候来。
All the reporters rushed to the telephone to call in their stories when the game was over.
比赛结束时, 所有的记者都冲到电话机房, 用电话把采访的情况传递出去。
在这里应该是第二种解释
call at的意思有：
1.到…进行短暂访问
He called at Mr. James this afternoon.
他今天下午到詹姆斯先生家去拜访了他。
2.停留
Does the ship call at Hong Kong?
这艘船在香港停靠吗?
call for的意思有：
1.去接(某人), 去取(某物)
I will call for you tomorrow and we'll go to the park together.
我明天去接你, 咱们一块儿去公园。
When will you call for the article?
你什么时候来拿稿子?
The goods will be called for by Mr. White's son.
这些货物将由怀特先生的儿子来领取。
2.需要
More work doesn't necessarily call for more men.
增加工作不一定要增加人员。
Your plan will call for a lot of money.
你的计划需要许多钱。
She was willing to help, but her services were not called for.
她倒是愿意帮忙, 只是已经没有请她帮忙的必要了。
3.要求
The letter calls for an investigation of the facts.
来信要求对这些事实进行调查。
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