【题目】The average income of the Changzhou, though still well below that of Suzhou, has been on the increase and is three times ______ it was in 2001.
A．that B．which C．what D．how
在线课程【答案】C
【解析】句意：常州的平均收入，虽然仍然在苏州之下，但一直在持续增长，而且已是2001年的三倍了。what可以表示“……的数量或数目”，用在倍数表达中。故选C项。