The teacher speaks very loudly all the students can hear her.A. so thatB. becauseC. since

问题补充：

The teacher speaks very loudly all the students can hear her.

A. so that

B. because

C. since

D. when

答案：

(答案→)A. so that

B. because

C. since

D. when

解析：句意为为了让所有学生都能听见她，老师讲得非常大声。A. so that 是固定词组，引导目的状语从句时，表示“以便；为了”，从句中常使用can /could /may /might /will /would /should等情态动词或助动词，因此选A。B.because 意为“因为”.C.since 表示“自...以来，因为，由于”。D.when 意为“当...时”。所以，B,C,D均不符合题意。