问题补充:
good habits very important.
A. Having; is
B. Having; are
C. Have; is
D. Have; are
答案:
(答案→)A. Having; is
B. Having; are
C. Have; is
D. Have; are
解析:考察动名词做主语。养成好习惯这一件事做主语,谓语用单数。故选A
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