问题

E-shopping,when properly _____,can save us a lot of time and energy[ ]
A: done
B: is done
C: having done
D: doing
B: is done
C: having done
D: doing
正确答案是:
同类题型
I hear that Jane has achieved great success. — ________ and __________.
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ting a composition, there must not beone sentence or even one word which is brought in ______
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t it verydifficult to carry on the work all by myself —Icould have helped you, but you _____me to