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Can  I ask       you    to  china  before?
A．What ;have been.B．if ;have been.C． how, have gone .D．if ; have gone.
B

試題分析：句意：我能問你以前是否到過中國嗎？結合語境可知賓語從句中不缺少句子成分，根據從句時間狀語可知從句中描述的是現在已經完成的動作，故用現在完成時態。選項D表示瞬間動作，結合語境可知選B。
點評：賓語從句中一般為陳述語序，需注意當疑問詞做從句主語時，則貌似倒裝句，需注意區分。關于引導詞的區分需結合引導詞的基本含義及其在句子中所承擔的句子成分進行具體分析。賓語從句的時態和主句沒有必然的聯系，需結合語境具體分析。
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