She always watches her son ________ the road every morning, or she will feel worried.
#48963
A
crossing
B
cross
C
to cross
D
to crossing
推荐题目
—Do you want ____for your son? —Yes, I do.
#48861
A
to buy any books
B
buy any books
C
to buy some books
D
buy some books
We’ll do what we can _________ our environment.
#49518
A
protect 
B
to protect 
C
be protected 
D
be protecting
He seems _______ nice.     
#50400
A
to be
B
is
C
that
D
was