单项选择题

It is much （）to go up than it is to come down.

A.hard
B.harder
C.hardest

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单项选择题
— The radio says it will be raining tomorrow.— I'll stay at home if it （）

A.rains
B.will rain
C.rained
单项选择题
The students love her （）she is so kind and helpful.

A.but
B.so
C.because
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