问题
选择题
--Do you know what caused the accident? --- No, not yet. The matter _____.
A．is being looked into
B．was being looked into
C．looked into
D．is looked into
答案
答案：A
考查时态语态。因为回答是还没有知道，说明这件事情还在调查之中。所以用现在进行时。
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