________ your composition carefully,some spelling mistakes c

題目：

________ your composition carefully,some spelling mistakes can be avoided.
A.Having checked
B.Check
C.If you check
D.To check 爲什麼選C?

解答：

這句意思很明顯
如果你檢查的仔細點,一些拼寫錯誤是可以被避免的.
第一個是表示已經仔細檢查過了,第二個是錯的,第四個是表示一個目的,而不原因
再問： 那A的這種用法適合用在哪裡？？ 還有having done 和doing如果在句首用哪個
再答： 給你舉個例子

Having checked his composition careflully, Jim hand it over to the teacher and leave.

Jim went to the playground, playing football.

伴隨狀語不被主句時態影響