—It’s necessary ____ our environment(环境).  —I agree with you. 
#50553
A
protect(保护)
B
protecting
C
to protect
D
protects
推荐题目
 --- It’s so cold today. Would you mind my ____________ the door?--- ____________. Do it as you like.
#48459
A
to close; Not at all
B
closing; Never mind
C
closing; Certainly not
D
to close; Better not
He used to _______in the sun  ,but now he is used to ______at night.
#48575
A
read;read
B
reading;read
C
read; reading
D
reading; reading