单项选择题

20 … an English course can be an interesting experience.

A. To assist
B. To attend
C. Attending
D. Assisting
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单项选择题
18 our new brochure, which should arrive next week.
A. I just have sent
B. I have just sent
C. just I have sent
D. I have sent just
单项选择题
19 When the post…, I’ll bring it into your office.
A. will arrive
B. arrives
C. is arriving
D. is going to arrive
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