--Do you know what caused the accident?       --- No, not yet. The matter _____.
A．is being looked intoB．was being looked into C．looked into D．is looked into
A
考查時態(tài)語態(tài)。因為回答是還沒有知道，說明這件事情還在調(diào)查之中。所以用現(xiàn)在進行時。
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