自1840年以来，西方列强侵略中国，中 * * 备受屈辱。标志着我国完全沦为半殖民地半封建社会的不平等条约是[ ]

A．《南京条约》

B．《北京条约》

C．《马关条约》

D．《辛丑条约》

I soon found that the work I was doing had already been done, _____, I was wasting my time.

A．in a word

B．in other words

C．so that

D．above all