Wait _____a flower to grow.

Wait _____a flower to grow.
Wait _____a flower to grow.

Wait _____a flower to grow.
这是一个祈使句,Wait 为主语 虽应当用V+ING结构 但祈使句中可以不用
Wait构成的短语是for sth 和to do sth 由此看来 应该是for

for (wait for 等待
)

for，表目的
等待花儿开放

for