10．-Excuse me，what's this for？
-It's a cleaner and it        to pick up dirt．（　�。�
A．usesB．is usedC．is usingD．used

分析 --打擾了，這個是用來干什么的？
--是吸塵器，用來清理灰塵的．

解答 答案：B．
首先根據(jù)語境推測答語的句意是"是吸塵器，用來清理灰塵的．"，由于句子表述的是一般性的事實，所以用一般現(xiàn)在時，主語it 是動作use 的承受者，所以用被動語態(tài)，一般現(xiàn)在時被動語態(tài)的構(gòu)成是：主語+am/is/are+動詞的過去分詞，故選B．

點評 本題考查時態(tài)和語態(tài)．每個時態(tài)都有標(biāo)志詞，熟記這些標(biāo)志詞是做題的關(guān)鍵．在沒有時間狀語的情況下可以根據(jù)語境來對時態(tài)做出判斷．判斷語態(tài)的關(guān)鍵則是觀察主語是謂語動詞的執(zhí)行者還是承受者．

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