A．either B．oneC．it D．noneI have got many collections of……

单项选择题——How many elephants have you seen——.

单项选择题——Where are the ——They are playing football on the playground.

单项选择题—Peter,where did you guys go for the summer vacation—We working for months,so we went to the beach to relax ourselves.

单项选择题David is goodEnglish, but he doesnt do wellPE.

单项选择题.So far we have done a lot to build a lowcarbon economy,but it is ideal.We have to work still harder.