单选题：What\we must do now__________make a careful investigation o

题目内容：

What\we must do now__________make a careful investigation on the circumstances. A．are
B．is
C．is to
D．were to

参考答案：

答案解析：

Eat as many vegetables as possible,for they are rich_______

Eat as many vegetables as possible,for they are rich__________iron.\A．of B．in C

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