A. since B. whiles C. when D. as
A. since B. as C. when D. for
A. but, but B. and, and C. or, but D. or, or
And B. So C. Because D. However
A. even though B. so that C. because D. as if
A. Both, and B. Neither, nor C. Either, or D. Not only, but also
A. why B. when C. how D. where
A. though B. after C. before D. since
A. Neither B. Either C. Both D. None
A. so, that B. such, that C. as, as D. not so, as
微信支付 
支付宝支付