Question

英语试题2

Glaciers begin to form------more snow falls during the winter than melts and evaporates in the summer.
A is when
B when there are
C when
D when does

为什么选C 不是B

Answer 1

when引导时间状语从句。
若选B，即构词句子 there are more snow falls during the winter than melts and evaporates in the summer. 此句存在语法错误，因为后面出现了谓语动词falls和evaporates. 故不能用there be 型.
故选C。