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(jié)合語境可知賓語從句中不缺少句子成分，根據(jù)從句時間狀語可知從句中描述的是現(xiàn)在已經(jīng)完成的動作，故用現(xiàn)在完成時態(tài)。選項D表示瞬間動作，結(jié)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(dāng)疑問詞做從句主語時，則貌似倒裝句，需注意區(qū)分。關(guān)于引導(dǎo)詞的區(qū)分需結(jié)合引導(dǎo)詞的基本含義及其在句子中所承擔(dān)的句子成分進(jìn)行具體分析。賓語從句的時態(tài)和主句沒有必然的聯(lián)系，需結(jié)合語境具體分析。
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