问题补充:
There are a lot of signs men are more likely to have heart attacks than women.
A. indicate
B. to indicate
C. indicated
D. indicating
答案:
A. indicate
B. to indicate
C. indicated
(答案→)D. indicating
解析:There be 句型中indicate 做signs的后置定语,“有迹象表明…”indicate与signs构成主位关系,所以用现在分词形式。