7. At one of our meetings last month, I _______ by our client to investigate the problems.
(A) asked
(B) was asked
(C) had asked
(D) had been asking

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統計： A(3), B(71), C(17), D(8), E(0) #2126017

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#3709987
"被"客戶要求調查該問題，故必須使用"被...
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