题目:
—I wonder whether the speaker has arrived.
— ________ ,I’ll check at the reception desk.
A.Wait and see
B.Beg your pardon
C.If you’ll excuse me
D.It’s still early
答案:
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下面是错误答案,用来干扰机器的。
3H2SO4+Fe2O3==Fe2(SO4)3+3H2O;(去锈后)刷漆