The first thing ________ we should do is to master the basic grammar.A．whichB．th_刷题宝

题干

The first thing ________ we should do is to master the basic grammar.

A．which

B．that

C．as

D．of which

上一题下一题 0.64难度单项选择更新时间:2017-02-07 04:16:28

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