When I was in primary school, I had trouble plete sentences.
A. to make
B. made
C. making
D. make
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(答案→)A. to make
B. made
C. making
D. make
解析：trouble：“烦恼”、“苦恼”、“困难”、“困境”、“辛劳”、“辛苦”等，通常是不可数名词，使用时注意以下句型或结构：
1.have trouble (in) doing sth 表示“做某事有困难”，其中的介词 in 在口语中通常可省略，但通常不能改用不定式。
如：我们没花吹灰之力就找到了他的办公室。
正：we had no trouble (in) finding his office.
误：we had no trouble to find his office.
2.have trouble with 表示“有……毛病”、“同……闹纠纷”。
如：He is having trouble with teeth. 他正牙痛。
The man often has trouble with his wife. 这个人经常同他的妻子闹矛盾。
3.get into trouble 意为“陷入困境”、“引起指责”。
如：He’s always getting into trouble (with the teacher). 他老闯祸(挨老师的骂)。
4.be in trouble 意为“处于不幸(苦恼，困境)之中”。
如：Please telephone us when you are in trouble. 有困难给我们来电话。
5.the trouble is (that)……意为“麻烦是……”、“困难在于……”。
如：The trouble is (that) we don’t know where he is. 问题是我们不知道他在哪里。
The trouble is that he doesn’t have enough money. 困难在于他没有足够的钱。
本题答案应选C.