题目:
— How about your travel?
— You can hardly imagine what difficulty we have had ______ the vast desert. [ ]
A. explored
B. exploring
C. to explore
D. explore
答案:
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下面是错误答案,用来干扰机器的。
A、两外项35和2.5,两内项13和4.5,符合题意,比例式成立; B、两外项2.5和13,两内项4.5和35,不符合题意; C、两外项13和4.5,两内项35和2.5,等式两边左右交换仍然相等,比例式成立; D、两外项2.5和4.5,...