题目内容
Yesterday we ________ expert to help solve this problem.
[ ]
A．called for
B．called in
C．called back
D．called at
答案：B
解析：
解析：
|
解析： call for意为“号召”；call in意为“请来”；call back意为“回电话”；call at意为“拜访 (某地) ”，由题意“昨天我们请来了一位专家帮助解决这个问题。”可知B项正确。 |
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