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

________ your homework yet– Not yet. I _______ it.

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下列各句中，表达得体的一句是

Susan has been working hard day and night, which ________ her pale face.

The concert was wonderful!—Really How I wish I ______to the theatrewith you yesterday!