标题: 求助一道语法题~ [打印本页] 作者: 空杯心澄 时间: 2016-2-28 00:30 标题: 求助一道语法题~ Tropical bats play important roles in the rain forest ecosystem, aiding in the dispersal of cashew, date, and fig seeds; pollinating banana, breadfruit, and mango trees; and indirectly help produce tequila by pollinating agave plants.
A
pollinating banana, breadfruit, and mango trees; and indirectly help produce
B
pollinating banana, breadfruit, and mango trees; and indirectly helping to produce
C
pollinating banana, breadfruit, and mango trees; and they indirectly help to produce
D
they pollinate banana, breadfruit, and mango trees; and indirectly help producing
E
they pollinate banana, breadfruit, and mango trees; indirectly helping the producing of