1.選A fell off 是fall off的一般過去式 意思：跌倒,向下傾斜 ,強(qiáng)調(diào)的是“跌落、從……掉下來”,后直接接賓語.
The girl is falling off the bike.（= The girl is falling down from the bike.）
女孩正從自行車上摔下來.
They spread a big net in case Tom should fall off the tree and get hurt.
他們張開一張大網(wǎng)以防湯姆從樹上掉下來受傷.
fall down 倒塌,掉下,不強(qiáng)調(diào)落物的來處
2.選C
get+sth.+done使某事被做 ,而這里的cut的被動(dòng)形式還是cut,所以選C
You must get your homework done before you watch TV.你看電視前務(wù)必把家庭作業(yè)完成.
You'd better go and get your hair cut.你最好去理個(gè)發(fā).