The present population of this city is three times（ ）it was ten years ago.The present population of this city is three times（ ）it was ten years ago.A.what B.since C.that D.as 正确答案是A,为何不选C?

The population of the earth_______increasing fast.One third of the populati 是to the present还是to present? at present 与 for the present 区别 The simple present tense the present life;this what was the present? What's the present? Live in the Present at the present up to the present at the present present to the class present to the class The Present Progressive the people present是什么意思 well Treasures the present The present continuous tense Where is the present?