【题目】I am optimistic ________ I believe human beings do not always try to make life worse for themselves.
A. now thatB. for thatC. so thatD. in that
在线课程【答案】D
【解析】
考查短语辨析。句意：我很乐观，因为我相信人类并不总是试图让自己的生活变得更糟。A. now that既然；B. for that对于说；C. so that以便；所以；D. in that因为。根据句意故选D。