高拉速时，会出现带液芯矫直，可采用压缩铸造，采用压缩铸造的目的是为了防止铸坯产生（）缺陷。
参考答案：内裂
_What did he say on the phone just now
_ He suggested that we ______ a good rest.
A．would have
B．have
C．had
D．had had
