He often __________emails to his parents on weekends.
A．sendB．sendsC．is sendingD．will send
B

試題分析：根據(jù)語境可知此句的含義是在周末他經(jīng)常在周末給父母發(fā)電子郵件，因句中有副詞often，說明是經(jīng)常性的動作，故用一般現(xiàn)在時，且主語是he故謂語動詞要用單數(shù)形式，故選B。
點評：一般現(xiàn)在時表示現(xiàn)在經(jīng)常反復發(fā)生的動作、存在的狀態(tài)或習慣性的動作的時態(tài)。一般現(xiàn)在時用行為動詞的原形，但第三人稱單數(shù)作主語時，動詞的詞尾要加-S。其基本結(jié)構(gòu)是主語+動詞原形+賓語，.表示經(jīng)常的或習慣性的動作，常與表示頻度的時間狀語連用。
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