______ is known to us all is that maths is one of the most difficult subjects.
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| ______ is known to us all is that maths is one of the most difficult subjects. |
| [ ] |
A. As
B. That
C. It
D. What |
答案
| D |
举一反三
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|
_______I want to know is __________I can master English in the shortest time.| A．What; how | B． How; what | C．Which; what | D．What; what |
|
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