John stopped (to write) his letter (because) he had to (leave) (for the hospital).
A、
to write
B、
because
C、
leave
D、
for the hospital
【正确答案】
A
【答案解析】
stop to do sth．“停下来去做某事”：stop doing sth．“停止做某事”。根据句意，改"to write'为“writing”。
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