1.Thegirlinwhitemustbeanurse,
a.isn'tshe
b.mustn'tshe
c.maynotshe
d.didn'tshe
为什么不是b?
2.Thisexerciseis__difficult_____.
a.so;thatfewofuscando
b.so;thatfewofuscandoit
c.too;foranyoneofustodo
d.too'foranyoneofustodoit
答案是b我选a,为什么要接it?顺便解释下什么叫复合句