.More than a dozen students in that school ＿＿＿ abroad to study medicine last year.
| A．sent | B．were sent | C．had sent | D．had been sen t |
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.More than a dozen students in that school ＿＿＿ abroad to study medicine last year.
| A．sent | B．were sent | C．had sent | D．had been sent |
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