The plan for the new design occurred to Mr. Smith______on his work recently.
A．while concentratedB．while concentrating
C．while he concentratedD．while concentrating himself
C
C 此題易選B, 認(rèn)為題干是個(gè)省略句, 過去分詞作時(shí)間狀語。如果是省略句的話，省略的成分應(yīng)該與的主句的主語和be動(dòng)詞相同，而且主句的主語是the plan，顯然是不能作過去分詞concentrated的邏輯主語的。
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