下列选项中，关于数量的增加或减少的表述，正确的是（）。

A.降低到80％，即原来为100，现在为20

B.超额80％，即定额为100，现为180

C.增加到过去的2倍，即过去为1，现在为3

D.减少到过去的1/2，即过去为2，现在为4

These visitors had to ____ at this small and simple hotel for the night because the big hotels were full

in the busy season.[ ]

A. call up

B. pick up

C. put up

D. make up