17．More than 100students in that school_________ abroad for further study so far．（　�。�
A．are sentB．were sentC．had been sentD．have been sent

分析 到目前為止，那個學校已經(jīng)有100多人被送往國外深造了．

解答 答案是． 考查被動語態(tài)，．本題考查現(xiàn)在完成時和被動語態(tài)，so far常與現(xiàn)在完成時連用，student是和send是動賓關(guān)系，即，學生是被派往國外的，應(yīng)該使用被動語態(tài)，故選D．

點評 被動語態(tài)由"助動詞be+及物動詞的過去分詞"構(gòu)成．被動語態(tài)的時態(tài)變化只改變be的形式，過去分詞部分不變．疑問式和否定式的變化也如此．掌握各種時態(tài)的被動語態(tài)是解題的關(guān)鍵．

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