问题补充:
The wallet must LiLei’s. Look! It has his ID card in it.
A. be
B. belong
C. is
D. belong to
答案:
(答案→)A. be
B. belong
C. is
D. belong to
解析:be 系动词,是;belong属于;is第三人称单数系动词;belong to属于。句意:这个钱包一定是李磊的。看,里面有他的身份证。Belong表示属于时,后面接名词作宾语,根据前文情态动词must可知后面动词用原形,选A。