问题

The experiment shows that proper amounts of exercise, if _____regularly, can improve our health [ ]

A: being carried out
B: carrying out
C: carried out
D: to carry out

正确答案是：

同类题型

I hear you have to run for half an hourevery day.— Right. It is one ofthein myschool.

Which of the underlined letters 划线字母 have the same sound

25The construction of the two new railway lines____by now

I’m very glad I have my own room in myhouse. I ______ do what I want in it.

The Ipad looks like ________ one I showed you last time, but if you take _______ second look, you will find it’s a different one.