4. The government threatened to _____ the already huge US trade deficit. A. add to

B. add up to

C. amount to

D. get to

答案：A

add to 增添

add up to 合计达，总括起来，意味着

amount to 合计，共计；（在意义、价值等方面）等同，接近

get to 到达， 接触到， 开始， 对……有影响