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问题: 一道英语

You needn't take the trouble_____those comlicated experiments.
A.to do
B.in doing
C.doing
D.do
答案是A,我选的是B……

解答:

take trouble to do sth.意思是尽心尽力地做
句意为你不必竭力做这些复杂的实验.
trouble后接doing 意为做事有什么麻烦,多用做have trouble (in) doing sth.