19．This time tomorrow，the professorwill be challenging （challenge） his students to develop and explain their own arguments．

分析 明天的這個時候，這位教授將會在挑戰(zhàn)他的學(xué)生，讓他們闡釋或解釋他們自己的論點．

解答 答案是will be challenging．本題考查將來進行時，將來進行時表示"將來某一點時間或段時間內(nèi)正在進行的動作"，其構(gòu)成常常用"will be+doing"；由題干中的"this time tomorrow（明天的這個時候）"判斷本題需要將來進行時，故答案是will be challenging．

點評 本題是要求用所給動詞的適當(dāng)形式填空，解題時首先考慮句中需要的是謂語動詞還是非謂語動詞；其次，如果是謂語動詞關(guān)注時態(tài)、語態(tài)和數(shù)的變化；如果是非謂語動詞要聯(lián)系非謂語的基本用法判斷非謂語的形式．

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