由as, which 引导的非限定性定语从句，as和which可代整个主句，which相当于and this或and that。1)As一般放在句首，which在句中。2) as也可在句中往往和see,know,expect等词连用。
a. He seemed not to have grasped what I meant, which/and this greatly upsets ...
由as, which 引导的非限定性定语从句，as和which可代整个主句，which相当于and this或and that。1)As一般放在句首，which在句中。2) as也可在句中往往和see,know,expect等词连用。
a. He seemed not to have grasped what I meant, which/and this greatly upsets ...