______they will send us an invitation is not yet known, _ we hope they will.

A．[ A ]lf; but

B．[ B ]That; so

C．[ C ]When; yet

D．[ D ]Whether; but

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参考答案

本题考查的是if与whether的用法。句意为：尚不知道他们是否会邀请我们，但是我们希望他们会。引导主语从句时只能用whether，而不能用if。第二处表示转折，用but。故选D。

1 Cars moved very slowly in the 1920s, but they ___________move more quickly than in 1910.

A．[ A ] were to can

B．[ B ] did

C．[ C ] will

D．[ D ] can

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2 根据下列材料，请回答题：

[ A ] find
[ B ] take　　
[ C ] show
[ D ] make sure

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A．[ A ]changed

B．[ B ]been developed

C．[ C ]been cleaned

D．[ D ]informed

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