问题

_________ all the pupils in the school felt the same effect of small classes remains to be researched.

A:That
B:Whether
C:What
D:If

正确答案是：

同类题型

Stanly has graduated from the university—It’s no wonder that I can’t see him these daysHe ___ in the city for six years

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____ my teacher’s help, I wouldn’t have made such great progress[ ]

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