----Martin Murray used to be afraid of ______ alone. ----But now he realizes that his mother is always there for him.
#48786
A
is
B
was
C
be
D
being
推荐题目
—It’s necessary ____ our environment(环境). —I agree with you.
#50553
A
protect(保护)
B
protecting
C
to protect
D
protects
