问题详情:
—The air pollution is terrible.
—It will be worse _______ we take action to protect the environment.
A. if B. unless C. until D. when
【回答】
B
知识点:连词
题型:选择题
问题详情:
—The air pollution is terrible.
—It will be worse _______ we take action to protect the environment.
A. if B. unless C. until D. when
【回答】
B
知识点:连词
题型:选择题