问题
选择题
You'd better the new students___our class.[ ]
A. introduce ;/
B. introduce ; to
C. to introduce ;/
D. to introduce ; to
答案
答案：B
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You'd better the new students___our class.[ ]
A. introduce ;/
B. introduce ; to
C. to introduce ;/
D. to introduce ; to
答案：B
＝0.1 mol/L的溶液中，Na+、CO32－、Cl－一定能大量共存