---Mary hasn't written to us for a long time.---What do you suppose __ to her?
A.happened
B.to happen
C.was happened
D.having happened
答案:A
注意这里的do you suppose是主句而不是插入语。
---Mary hasn't written to us for a long time.---What do you suppose __ to her?
A.happened
B.to happen
C.was happened
D.having happened
答案:A
注意这里的do you suppose是主句而不是插入语。