A-A+
A．She knows he's very busy.B．He's already help
问题详情
A．She knows he"s very busy.
B．He"s already helped her enough.
C．He doesn"t know enough chemistry.
D．She doesn"t need any help.
参考答案
正确答案：C
解析：W没有让M帮她写化学实验是因为M从来没有上过化学课(take chemistry)，恐怕W对M帮忙的结果不满意，因此正确答案是C。
