问题
选择题
We here in the rain. We might take shelter in the house over there .
A．mustn’t be standing
B．needn’t be standing
C．won’t be standing
D．may not be standing
答案
答案：B
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We here in the rain. We might take shelter in the house over there .
A．mustn’t be standing
B．needn’t be standing
C．won’t be standing
D．may not be standing
答案：B
2CaSO4 + 2X，X的化学式为 。