You must ______ a wide vocabulary if you want to learn a language well. 
#69288
A
set up
B
put on
C
settle down
D
build up
推荐题目
--What made her so upset? -- __________
#70991
A
Lost her bike.
B
Losing her bike,
C
She lost her bike .
D
Because of losing her bike.
As is known to all,the water in the sea______much salt.
#68980
A
holds
B
contains
C
includes
D
covers