问题

The first use of atomic weapons was in 1945, and their power ________ increased enormously ever since

A:is
B:was
C:has been
D:had been

正确答案是：

同类题型

Linda ______coffee or tea, but she likes orange juice.

Could you tell me ____—OK, let me check it for you.

Latest researchers show children _______ with high levels of air pollution during their first year of life run a great risk of developing certain disease[ ]

er to find _____ better job, he decided to study____ second foreign language.

Emergency line operators _______ always stay calm andmake sure that they get all the information they need to send help.