A．Having seen from a distance B．Having been seen from a distance C．Seeing from a distance D．Seen from a distance
单项选择题I passed the test. I（）it without your help.
A．would not pass B．didn't pass C．wouldn't have passed D．had not passed
单项选择题The laboratory technician often warns the trainees that they can't be（）careful in doing the experiment.
A．much B．so C．most D．too
